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1989 Mercury BlackMax 135HP Questions

Figz

Member
Any Mercury experts out there that can tell me what this wire is and module on the back of the outboard? It is disconnected and I do not know what it is used for.IMG_5271.jpeg
 
Is this the trim sensor?

I’m looking at my wiring diagrams and a wire that is brown with a white stripe seems to be the trim sensor wire. I’m trying to figure out how to get my trim gauge to work, but I’ve tested this wire with a tester and there’s no power going through it when I move the trim up and down.
 
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