Engine temp sender location on 1994 Merc 4.3LX w/Alpha One

Patrick_L

Seaman
Joined
Jun 22, 2016
Messages
58
I need to diagnose whether my temp gauge is faulty or sender itself. Where would i locate one ?
 

alldodge

Moderator
Staff member
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Mar 8, 2009
Messages
42,538
The sensor is on the thermostat housing and has one Tan colored wire.

To find out if your temp gauge is working, turn key ON then ground that wire and the gauge should peg hot
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
50,230
Most people ask this question need a new impeller.

An IR thermometer is a good way to know how warm the motor is
 
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