What is the yellow wire?

R

reb0707

Seaman Apprentice
Joined
May 29, 2011
Messages
45
I just bought a replacement tachometer for my 88 150. The tachometer looks identical to my old tachometer except where the green and black wire come out, there is an additional yellow wire. Does anyone know what this yellow wire if for?
 
F

flounderman

Petty Officer 3rd Class
Joined
Dec 20, 2005
Messages
93
Re: What is the yellow wire?

It is a ignition wire to power gauges when key is on. I have a '89 and that is what it does on mine. Double check with a test light.
 
Don S

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: What is the yellow wire?

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