Gauges not working! help troubleshoot!

Winsok

Seaman Apprentice
Joined
Jun 30, 2011
Messages
36
First off, i have a 1971 Mercruiser 140, gm 3.0l 181cid.

I just got it all back together, and im curious were would i first check. The spedometer works, and i think the voltage meter works for the battery, but the tach and the trim gauge doesnt work, and i have no idea if the temp gauge works. it doenst move but maybe its staying cold? could my slave solenoid be bad? or is none of that correspond with the slave solenoid. Im at a loss here on whats wrong or were to even check first.
 

dlplost

Petty Officer 2nd Class
Joined
Jun 6, 2008
Messages
117
Re: Gauges not working! help troubleshoot!

Check your ground connection between the Batt and the Instruments.
They need BOTH power and ground.
 
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