C2 Electrical

[Mike R.]

Hi

My 65 had an aftermaket temp. gauge installed in it when i bought it.
I recently purchased the correct gauge and installed it. when I turn the key on the gauge pegg's to the right.
I used the original wiring and clip as it was still there (the after market gauge did not use any of the wires).
Anybody have any ideas?
Thanks
Mike

[Wayne W.]

Re: C2 Electrical

Find the sender on the engine. Remove the wire. Alternately ground and open the wire and watch the guage. It should deflect full both ways. If it doesnt, there is something wrong with the wiring or guage. If it does, the sender is bad.

[Rich G.]

Re: C2 Electrical

Also, if that works, an 80 ohm resistor from the sender lead to ground (no sender in circuit) should give you around 210 degree reading. 40 ohms should give you red-line.

Full deflection means zero resistance to ground, so there probably is broken insulation allowing the wire from the sender to ground out.

Rich Giannotti

[Mike R.]

Re: C2 Electrical

Wayne and Rich

Thanks for the info.

[Michael H.]

Re: C2 Electrical

You can use a variable resistor to determine how much resistance is required to calibrate the temperature gauge. Get an actual water temperature reading using a laser temperature gun and compare that reading to the water temp gauge in the instrument panel. Adjust the variable resistor until the readings are identical. Use a multi-meter to measure the resistance of the variable gauge and insert an appropriate resistor(s) in the sender wire.