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4406A2
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4177A3
Genuine Mercury Marine Remote Control Power Trim Switch
Mercury 4000 Side Mount Trim Switch and Harness - 18286A43
Mercury Marine 18286A43 is the genuine OEM power trim and tilt switch with harness for compatible Mercury remote controls, including the 4000 Side Mount Power Trim control.
Mercury OEM 18286A43 replaces earlier switch/harness numbers 18286A26, 18286A2 and 16991A1.
Looking for an aftermarket option? Pro Marine also offers the Pro Marine 18286P Switch/Harness Assembly for the same application.
Part Type: Power Trim and Tilt Switch / Harness
Manufacturer: Mercury Marine
OEM or Aftermarket: Genuine OEM
Primary Application: Mercury 4000 Side Mount Power Trim Control
Control Application: 1994-Present
Manufacturer Item #: 18286A43
Replaces: 18286A26, 18286A2, 16991A1
Compatible Applications
Mercury OEM 18286A43 is listed in the supplied Mercury catalog fitment for the following remote-control and boat applications.
| Application | Years | Fitment Details |
|---|---|---|
| Mercury 4000 Side Mount Control | 1994-Present | Side Mount Remote Control with Power Trim |
| Mercury Amanzi 320 Hypalon RIB | 2004-2006 | Remote Control Components |
| Mercury Amanzi 380 Hypalon RIB | 2004-2006 | Remote Control Components |
This switch is identified primarily by the Mercury remote-control assembly, not by engine horsepower alone.
The supplied Mercury catalog application identifies 18286A43 with the 4000 Side Mount Power Trim control from 1994-Present.
Before ordering, verify your remote-control configuration and confirm that the original switch crosses to 18286A43, 18286A26, 18286A2 or 16991A1.
OEM and Cross Reference Numbers
Mercury has used several part numbers for this switch and harness assembly. 18286A43 is the current OEM number replacing the earlier Mercury numbers listed below.
| Brand | Part Number | Status |
|---|---|---|
| Mercury Marine OEM | 18286A43 | Current OEM Number |
| Mercury Marine OEM | 18286A26 | Previous Number |
| Mercury Marine OEM | 18286A2 | Previous Number |
| Mercury Marine OEM | 16991A1 | Previous Number |
Pro Marine Replacement Available
Pro Marine also offers an aftermarket replacement for customers looking for an alternative to the genuine Mercury assembly.
Choose between the genuine Mercury OEM 18286A43 and the Pro Marine 18286P aftermarket replacement.
View Pro Marine 18286P Switch/HarnessMercury OEM or Pro Marine?
| Option | Part Number | Brand |
|---|---|---|
| Genuine OEM | 18286A43 | Mercury Marine |
| Aftermarket | 18286P | Pro Marine |
What This Part is Used For
Mercury 18286A43 is installed in the compatible remote-control handle and allows the operator to control the engine's power trim and tilt system from the throttle/control handle.
The switch provides trim-up and trim-down control, while the attached harness connects the switch into the remote-control wiring.
This allows the operator to adjust engine trim while underway or raise and lower the engine as required without leaving the control handle.
Common Signs of a Worn Remote Trim Switch
The trim switch is repeatedly operated and exposed to the marine environment. Over time, the switch contacts, button or attached wiring can become worn or damaged.
- Trim works from the engine switch but not from the control handle
- Intermittent trim-up or trim-down operation
- One trim direction operates while the other does not
- The switch must be pressed repeatedly before the system responds
- Visible damage or wear to the trim switch
- Damaged, pinched or deteriorated switch wiring
A power trim system that does not operate from the throttle handle does not automatically indicate a failed trim motor or pump.
If the trim system works correctly from another switch but not from the remote-control handle, inspect the trim switch, switch harness, electrical connectors and related wiring as part of the diagnosis.
Installation and Replacement Tips
- Disconnect battery power before servicing the remote control.
- Confirm the existing switch part number before removal.
- Note the routing of the original harness before disassembly.
- Inspect connectors and control wiring for corrosion or damage.
- Route the new harness so it cannot become pinched during reassembly.
- Verify both trim-up and trim-down operation after installation.
- Follow Mercury service procedures for the specific remote control.
Key Features and Benefits
- Genuine Mercury Marine OEM component
- Mercury manufacturer item number 18286A43
- Power trim and tilt switch with attached harness
- Fits applicable Mercury 4000 Side Mount Power Trim controls
- Supplied catalog fitment lists the control from 1994-Present
- Replaces Mercury 18286A26
- Replaces Mercury 18286A2
- Replaces Mercury 16991A1
- Pro Marine aftermarket version also available
FAQ
What does Mercury 18286A43 fit?
The supplied Mercury catalog fitment lists 18286A43 for the
Mercury 4000 Side Mount Power Trim control from
1994-Present. It is also shown in the remote-control components
for the 2004-2006 Mercury Amanzi 320 and 380 Hypalon RIB applications.
What does Mercury 18286A43 replace?
Mercury 18286A43 replaces previous switch/harness numbers
18286A26, 18286A2 and 16991A1.
Does 18286A43 replace 18286A26?
Yes. 18286A26 is an earlier Mercury number superseded by
18286A43.
Does 18286A43 replace 18286A2?
Yes. 18286A2 is an earlier Mercury switch/harness
number in the replacement chain.
Does 18286A43 replace 16991A1?
Yes. 16991A1 is also an earlier Mercury number
associated with this switch/harness application.
Is this the switch in the throttle handle?
Yes. On the applicable Mercury remote control, this is the switch used
to operate power trim and tilt from the control handle.
Does the switch include the wiring harness?
Yes. This listing is for the switch and harness assembly.
Is this a genuine Mercury part?
Yes. This listing is for the
genuine Mercury Marine OEM 18286A43 switch/harness
assembly.
Do you carry an aftermarket version?
Yes. Pro Marine also offers the
Pro Marine 18286P Switch/Harness Assembly
.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Parts must be new, unused, and in original packaging.
- Installed parts are not returnable.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Part Numbers
18286A43, 87-18286A43, 18286A26, 87-18286A26, 18286A2, 87-18286A2, 16991A1, 87-16991A1
Searchable Terms
Mercury 18286A43, Mercury OEM trim switch, Mercury trim switch, Mercury tilt switch, Mercury power trim switch, Mercury remote control trim switch, Mercury switch harness, Mercury 4000 trim switch, Mercury 4000 side mount trim switch, Mercury throttle handle trim switch, Mercury control box trim switch, Mercury remote trim switch
18286A2
18286A26
18286A43
194-5279
8M0084173
815279T
8152793
8152795
830179T
8301792
854515
854515T1
856748
883072T
194-8825K1
88825A1
88825A7
Sierra Replacement Mercury Outboard Control Module
Mercury V135, V140, V150, V200, XR-6 & 140 Jet Control Module - Sierra 18-99253
The Sierra 18-99253 Control Module is an aftermarket replacement for select Mercury outboard engines using Mercury 857185T1 and related control module applications.
Verified fitment includes select V-135, V-140, V-150, V-200, XR-6 / Magnum III and 140 Jet Mercury outboards.
The original Mercury OEM version of this module is no longer available. Sierra 18-99253 is the available replacement option for these applications.
Mercury has discontinued the original OEM control module used in these applications.
The Sierra 18-99253 is the available replacement for compatible engines that originally used Mercury 857185T1.
OEM & Cross Reference Numbers
| Brand / Type | Part Number |
|---|---|
| Sierra | 18-99253 |
| Cross Reference | 144-7185 |
| Mercury OEM | 857185T1 |
Mercury Outboard Fitment
| Mercury Engine | Serial Number Range |
|---|---|
| V-135 | 0G960500 thru 0T178499 |
| 140 Jet | 0G960500 thru 0T178499 |
| V-140 International | 0T178500 thru 1B226999 |
| V-150 | 0G960500 thru 1B226999 |
| XR-6 / Magnum III | 0G960500 thru 1B226999 |
| V-200 | 0G960500 thru 1B226999 |
Mercury used different electrical components across similar horsepower ranges. Do not order this control module by horsepower alone.
Verify the complete engine serial number and confirm the original module cross references 857185T1 or 144-7185 before ordering.
What This Control Module Does
The control module is part of the engine's electronic control system and helps manage the electrical functions assigned to the module within the Mercury outboard ignition / engine management system.
A failed control module can result in ignition or engine-running issues depending on the exact engine configuration and failure mode.
Common Reasons for Replacement
- Original Mercury module has failed
- Intermittent ignition or engine electrical problem
- Module has visible heat or electrical damage
- Diagnostic testing identifies the module as faulty
- Original Mercury 857185T1 is no longer available
Before Replacing the Module
Electronic control modules should not be replaced solely based on symptoms. Verify related wiring, grounds, connectors, stator / trigger components, charging voltage and other ignition-system components as applicable to the engine.
Follow Mercury service procedures for the exact engine and serial number before condemning the module.
Why Use Sierra 18-99253?
- Sierra aftermarket replacement control module
- Replaces discontinued Mercury OEM 857185T1
- Cross references 144-7185
- Fits select Mercury V-135 outboards
- Fits select Mercury V-140 International outboards
- Fits select Mercury V-150 outboards
- Fits select Mercury V-200 outboards
- Fits select Mercury XR-6 / Magnum III engines
- Fits select Mercury 140 Jet applications
- Available replacement now that the OEM module is discontinued
FAQ
Is Sierra 18-99253 an OEM Mercury part?
No. This is a Sierra aftermarket replacement.
What Mercury part number does 18-99253 replace?
It replaces Mercury 857185T1 and cross references
144-7185.
Is the original Mercury control module still available?
No. The Mercury OEM version is no longer available.
Sierra 18-99253 is the available replacement for compatible applications.
Does it fit Mercury V-150?
Yes. Verified fitment includes V-150 engines from
0G960500 thru 1B226999.
Does it fit Mercury XR-6?
Yes. Verified XR-6 / Magnum III fitment includes serial
0G960500 thru 1B226999.
Does it fit Mercury V-200?
Yes. Verified V-200 applications include serial
0G960500 thru 1B226999.
Does it fit Mercury V-135?
Yes. Verified V-135 fitment is
0G960500 thru 0T178499.
Does it fit a Mercury 140 Jet?
Yes. Verified 140 Jet applications are
0G960500 thru 0T178499.
Should I verify my serial number before ordering?
Yes. Mercury used different electrical components across similar engine
families, so the serial number should always be verified.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Parts must be new, unused, and in original packaging.
- Installed electrical parts are not returnable.
- Return authorization is required before sending items back.
Need help verifying fitment?
Contact Pro Marine
Phone: 941-721-3000
Searchable Terms
18-99253, Sierra 18-99253, 144-7185, 857185T1, Mercury 857185T1, Mercury control module, Mercury ignition control module, Mercury V135 control module, Mercury V140 control module, Mercury V150 control module, Mercury V200 control module, Mercury XR6 control module, Mercury XR-6 module, Mercury Magnum III module, Mercury 140 Jet control module, discontinued Mercury control module, Mercury 857185 replacement, Sierra Mercury control module, 0G960500, 0T178499, 0T178500, 1B226999
857185T1
18-5777-1
7452A11
7452A14
7452A21
7452A8
9-25103
Mercury 450R V8 Replacement Belt
Mercury 8M0159595 Belt
The Mercury 8M0159595 Belt is a replacement belt for compatible Mercury 450R V8 belt drive systems. A worn or damaged belt can cause squealing, slipping, charging issues, overheating concerns, or poor accessory drive performance.
When replacing this belt, inspect the belt tensioner and pulley assembly at the same time. The related Mercury 8M0164060 tensioner assembly is linked below.
Compatible Applications
| Engine / Application | Part Number |
|---|---|
| Mercury 450R V8 belt drive system | 8M0159595 |
Verify your engine serial number and original belt part number before ordering. Mercury belt lengths and belt drive components can vary by model and serial range.
OEM & Cross Reference Numbers
| Type | Part Number |
|---|---|
| Mercury OEM | 8M0159595 |
Related Tensioner Assembly
Mercury 8M0164060 Tensioner Assembly
If the belt is worn, slipping, squealing, or tracking incorrectly, inspect the tensioner assembly as well. A weak or noisy tensioner can shorten belt life and cause repeat belt problems.
What This Part is Used For
The engine belt transfers power through the belt drive system to related engine accessories. Proper belt condition is important for quiet operation, correct pulley tracking, and dependable accessory drive performance.
A belt should be replaced if it shows cracks, glazing, fraying, uneven wear, contamination, slipping, or noise. Because the belt works directly with the tensioner and pulleys, those parts should be inspected during the same service.
Key Features and Benefits
- Mercury OEM replacement belt
- Part number 8M0159595
- Used on compatible Mercury 450R V8 belt drive systems
- Helps restore proper belt drive operation
- Recommended replacement when the belt is cracked, glazed, noisy, or slipping
- Related Mercury 8M0164060 tensioner assembly linked above
- Good service practice is to inspect the belt, tensioner, and pulleys together
Common Signs of Belt Wear
| Symptom | What to Check |
|---|---|
| Squealing or chirping | Worn belt, weak tensioner, pulley alignment, or contamination |
| Cracks or fraying | Replace the belt and inspect pulley surfaces |
| Glazed belt surface | Slipping belt, weak tensioner, or worn pulley contact |
| Uneven belt wear | Misalignment, tensioner wear, or pulley damage |
| Repeat belt failure | Inspect tensioner assembly and pulley system before installing another belt |
FAQ
What is the OEM number for this belt?
The OEM part number is 8M0159595.
What engine is this belt commonly used on?
This belt is listed for compatible Mercury 450R V8 belt drive systems.
Should I replace the tensioner when replacing the belt?
Not always, but the tensioner should be inspected during belt service. If the
tensioner is weak, noisy, binding, or the pulley is worn, replace it with the
related 8M0164060 tensioner assembly.
Can a bad tensioner damage a new belt?
Yes. A weak, worn, or misaligned tensioner can cause slipping, noise, uneven
wear, and premature belt failure.
When should this belt be replaced?
Replace the belt if it is cracked, frayed, glazed, contaminated, slipping,
noisy, or showing uneven wear.
Do I need to verify fitment?
Yes. Always verify your engine serial number and original belt part number
before ordering.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Parts must be new, unused, and in original packaging.
- Installed parts are not returnable.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
8M0159595, Mercury 8M0159595, Mercury belt, Mercury 450R belt, Mercury 450R V8 belt, Mercury Racing 450R belt, Mercury outboard belt, Mercury replacement belt, Mercury belt drive, outboard engine belt, belt squeal Mercury outboard, Mercury belt replacement, Mercury pulley belt, 8M0164060, Mercury 8M0164060, Mercury tensioner assembly, Mercury 450R tensioner, belt and tensioner replacement
Mercury Belt Tensioner Assembly
Mercury 8M0164060 Tensioner Assembly
The Mercury 8M0164060 Tensioner Assembly is used in the belt drive system to help maintain proper belt tension and pulley alignment. A worn tensioner or pulley can lead to belt noise, slipping, uneven belt wear, or charging and accessory drive issues.
When replacing this tensioner assembly, it is usually a good idea to inspect and replace the belt at the same time. The related Mercury 8M0159595 belt is linked below.
Compatible Applications
| Engine / Application | Part Number |
|---|---|
| Mercury 450R V8 belt drive system | 8M0164060 |
Verify your engine serial number and original tensioner part number before ordering. Mercury belt drive components can vary by model and serial range. The related belt listed by Pro Marine is identified as fitting Mercury 450R V8.
OEM & Cross Reference Numbers
| Type | Part Number |
|---|---|
| Mercury OEM | 8M0164060 |
Related Belt Replacement
Mercury 8M0159595 Belt - Mercury 450R V8
It is common to replace the belt when servicing the tensioner or pulley. A worn belt can cause slipping, noise, poor charging performance, or premature wear on the new tensioner assembly.
What This Part is Used For
The belt tensioner assembly keeps proper tension on the engine belt so the belt can drive related engine accessories correctly. If the tensioner weakens, binds, or the pulley wears out, the belt may slip, squeal, track incorrectly, or wear faster than normal.
Replacing the tensioner assembly helps restore proper belt control. Because the belt rides directly on the pulley system, replacing the belt during the same service is often recommended.
Key Features and Benefits
- Mercury OEM tensioner assembly
- Part number 8M0164060
- Helps maintain correct belt tension
- Supports proper belt tracking and accessory drive operation
- Useful when repairing belt noise, slipping, or pulley wear
- Related Mercury 8M0159595 belt linked above
- Recommended to inspect or replace the belt during tensioner service
Common Signs of a Worn Tensioner or Belt
| Symptom | Possible Cause |
|---|---|
| Belt squeal or chirping | Weak tensioner, worn pulley, glazed belt, or misalignment |
| Visible belt wear | Pulley wear, improper tracking, or old belt |
| Belt slipping | Loss of tension or worn belt surface |
| Pulley noise | Worn bearing or damaged tensioner pulley |
FAQ
What is the OEM number for this tensioner?
The OEM part number is 8M0164060.
Should I replace the belt when replacing the tensioner?
Yes, it is usually recommended to inspect and replace the belt when servicing
the tensioner or pulley, especially if the belt shows wear, glazing, cracking,
noise, or slipping.
Which belt goes with this tensioner?
The related belt is Mercury 8M0159595, linked above.
What does the tensioner assembly do?
It keeps the engine belt under proper tension so the belt can drive related
engine accessories correctly.
Can a bad tensioner damage a new belt?
Yes. A worn or misaligned tensioner can cause premature belt wear, belt noise,
or belt tracking problems.
Do I need to verify fitment?
Yes. Always verify your engine serial number and original part number before
ordering Mercury belt drive components.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Parts must be new, unused, and in original packaging.
- Installed parts are not returnable.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
8M0164060, Mercury 8M0164060, Mercury tensioner assembly, Mercury belt tensioner, Mercury pulley tensioner, Mercury 450R tensioner, Mercury 450R V8 tensioner, Mercury Racing 450R tensioner, Mercury belt drive tensioner, outboard belt tensioner, Mercury belt pulley, 8M0159595, Mercury 8M0159595, Mercury 450R V8 belt, Mercury belt replacement, tensioner and belt replacement