The water temp gauge in my 57 GMC truck (stock 347" Pontiac
V8) has recently started reading very low. The wiring from
gauge to sending unit checked OK with a meter and the gauge
is receiving the proper +12VDC on the upstream side. The
gauge does move up slightly as the engine heats up, but
never exceeds 140 degrees. I really doubt the engine is
running that cool as the air temp here today is above 95.
I do not know if the problem lies with the gauge or sender.
The sender in my truck is GM part # 1513210. It was used
on all V8 trucks from 55-59. Any of you have one that you
want to get rid of?
Any of you ever troubleshot this circuit with a meter? If so,
what should the resistance of the sender be when cold? Hot?
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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