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Discussion Starter #1
My temp. gauge seems to be working backwards, starts out on the hot side and then moves to the center part of the gauge. Any ideas what might be wrong?
302 in a '50 Ford,12v
 

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if the mechanical gauge is designed to show cold and hot it will move both ways. An
automotive gauge NO. They usually start off at 0 then go to 250 or hot. They will not go
to -0. if they do you have your gauge connected to your A.C. system and if it isn't you
need a new gauge. So, what do you have ? electric or mechanical ? Just looked at your post again. The 50 ford is positive ground and 6 volts. If you have an electric gauge
connected to positive ground it will show cold as the engine heats up. Reverse polarity.
If this is the factory dash gauge you have to leave it positive ground. If you convert to
negative ground, and you probably did that is why your temp gauge shows backwards if it is factory, your gas gauge may also work backwards. It shouldn't but it might. Like i said before. Need to know what your doing. More info.
 

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Discussion Starter #5
The vehicle now is Neg. ground,the temp gauge is electrical. I switched the gauge wires,no effect,it's starts out on hot and then moves to the center in the normal zone.
The gas gauge works correctly.
So with Neg. ground and factory gauge that is the reason it works backward. Can this be made to work right?
 

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I would consider replacing it. What you're seeing really doesn't make sense and unreliable.
 

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Discussion Starter #8
Problem solved!!!

From what I have learned the temp. gauge doesn't care if it's pos. or neg. ground. The sender needs to match the gauge. I installed a stock flathead sender and the gauge now works perfect. When cold the needle parks on hot,when engine is started the needle goes to cold and as engine warms up the needle moves to the center.

:hy:
 
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