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Wire Harnesses

There are two basic types of harnesses. One is the Motor Harness and the other is the Instrument or Dash Harness.

The Motor Harness is the harness that is on the engine. It typically connects the starter, alternator, senders and ignition components together. Fuel injected engines will also have a Fuel Injection Harness.

The Instrument Harness connects the engine to the dash's keyswitch and gauges.

The Motor Harness and the Instrument Harness connect together through a large "cannon" plug. This plug is a likely source of problems as it can work loose or the connector pins can corrode and make for poor contact. The plug is designed to be held in place with a standard hose clamp. If the hose clamp is overtightened it can ruin both harnesses.

Mercruiser Instrument Harnesses come in lengths of 3', 20' and 25' but Mercruiser also has Harness Extension Kits of 10', 15', 20', 30' and even 45' lengths. The factory also makes two-station "Y"-Harness for dual station applications. The harnesses are all color coded for easy hook-up.

Almost every model of Mercruiser Engine uses a different Motor Harness.

The best way to order the correct Motor Harness is to EMAIL us your engine serial number.

If you are rewiring your boat and need help in selecting the harnesses, cables, remote control or gauges just let us know and we will set you up with exactly what you need.

Mercruiser Sterndrive Parts.
Pre-Alpha, R, MR and MC1 Parts
Alpha One Parts
Seal Kits
Alpha One Gimbal (Transom) Parts and Kits
Alpha Gen II Parts
Alpha Gen II Gimbal (Transom) Parts and Kits
Bravo One Parts
Bravo Two Parts
Bravo Three Parts
Bravo Gimbal (Transom) Parts and Kits
TR and TRS Parts
Transom Seal Kits
Gimbal Bearings
Shift Cable Kits
Gear Kits
Shift Interuptor Switch Kits
Anodes and Zinc Kits
Water Pump Kits
Power Trim Pump Kits and Trim System Parts
Decal Sets
Sterndrive Special Tools
Mercruiser shop Manuals
Remote Controls
Trim Sender Switches
Trim Cylinder Assemblies
Mercruiser Engine Parts
Filters and Filter Kits
Tuneup Kits
Carburetor Rebuild Kits
Raw Water Pump Kits
Circulation Water Pumps
Spark Plugs
Spark Plug Wire Kits
Gasket Sets
Exhaust Manifolds
Exhaust Elbows
Exhaust Riser Kits
Exhaust Water Shutter Kits
Ignition Modules and Ignition Coils
Cooling System Parts
Starter Motors
Alternators and Charging Systems
Belts and Belt-Pulley Kits
Drive Couplers
Fuel Pumps (Mechanical and Electric)
Wire Harnesses
Gauges and Instruments
Partial Engine Assemblies
Grease, Lubricants and Adhesives

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