wiring harness color codes

[snookfish]

I have a two part question about a wiring harness issue I'm having on a 2005 F115TXRD. 10 pin harness.

Part 1: The 10 pin harness that comes from the controls to the engine harness has of course ten wires but the engine harness only has nine. Once I match all colors I have a blue wire left. What does this wire go to or is it just extra?

Part 2: The reason for the first question is the pins in both of my harness have corroded away. This is the second time this has happen in a year and I have no idea why. The boat is only used in salt water 1-2 times a year, there is no other corrosion in the engine compartment. Any ideas what could be causing this??

I was boating Friday/Sat and had to cut both harness plugs off and used butt connects to get the engine back up and running. I have ordered new harnesses but would like to use the boat until the parts come in. I just want to make sure I have eveything wired correctly.

[99yam40]

see if this might help, not sure if it covers your F 2005 though
Wiring Color Codes for YAMAHA Outboard Motors.


maybe it is choke as you probably do not have that on the 2005

[snookfish]

Thank you!!!! I spent 2 hours yesterday googling everything I could think of to get this wiring chart. My repairs on the lake got me home but I was concerned about damage to the engine if I missed something. The blue pin on the engine harness was empty so you may be correct.

Have you heard of harnesses going bad like this. The last time I replaced it was Oct last year and I even sealed the top of the plug with liquid tape to help prevent any water from getting into it.

[99yam40]

Never heard of that happening that fast.
Did you fill connectors with grease to keep moisture out?
not sure what Yamaha uses, but I remember Johnnyrude's used a blue dielectric grease to help seal air and moisture out of connectors

[snookfish]

Yes I used a synthetic elec.grease, don't recall the brand. The harness was still full of grease but three pins had corroded away. Last time I only changed the control harness, maybe something very corrosive was still in the engine plug harness. If it goes bad again I think I will go back to butt connectors.