Tac wiring?

bullyjack

Active Member
i have a older merc 115hp inline 6 2 stroke outboard, the tac harness coming out of the front of the controlbox has 3 wires, white, black and brown. The tac has only 2 poles marked pos and neg. is this the wrong tac? The previous owner had the white and brown to the pos and black to neg and melted the white on the harness. I pretty sure the white is pos black grnd and brown signal. There is a small bolt in the center of the tac that isn’t marked.
 
I would think the same as you, brown being signal(coming from the coil). the white could be an internal light? White is the usual colour for dashboard lights.
the black might go to the bolt. the tach runs on current flowing thru the coil primary, not voltage.
 
Thanks, thats what i figured. Hope the tac works, hard to find one for this motor, tryin to stay retro.
 
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