68 Water Temp gauge Testing - Team Camaro Tech
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post #1 of 2 (permalink) Old Oct 26th, 09, 07:31 PM Thread Starter
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68 Water Temp gauge Testing

I've read many posts here and tried multiple suggestions within this forum trying to get my water temp gauge working. I finally went total "shadetree" on this and I need someone to tell me if this is completely wrong. The issue is the gauge won't move at all.

I finally took the car itself out of the equation. I removed the sending unit and put it in boiling water for 10 minutes -- I hooked up my meter and tested the sending unit - the resistance was very low when hot. As the unit cooled down, resistance went up. This suggests to me the sending unit is good (maybe not necessarily accurate, but at least functioning to some degree).

I then repeated boiling process, but this time I hooked the temp. gauge directly to the battery - duplicating the wiring diagram -- green post to tip of sending unit, base of sending unit to ground, pink post to positive side of battery. Ground post (body) properly grounded too. Gauge did not move at all - dead to the world.

This says to me -- its a bad gauge, right?

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post #2 of 2 (permalink) Old Oct 27th, 09, 03:10 AM
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Re: 68 Water Temp gauge Testing

Yep, pretty much so. If you have an analog meter, use the RX1K to use the 9-volt battery internal of the meter and place it across the meter studs. One direction should peg the meter.

Using a digital meter, use the diode function to allow more current to flow and do the same test, one direction should peg the meter.

If you read resistance, then the coil is good, D'Arsonval meter movement is stuck or spring is broke.

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