Dead temp gauge

[Ed Jennings]

The temp gauge in my 62 has always performed admirably, but yesterday it took a turn south. Started reading low, and then not at all. I tried testing the gauge, first by grounding the sender wire, and then by grounding the sender terminal with a jumper direct to ground. No dice. I presume that the gauge is toast, unless I am overlooking something. I guess there will be a gauge on my shopping list when I go to K'ville this weekend.
This failure took place just after I did a partial tune up, consisting of adjusting the timing and tweaking the fuel injection a little. I can see no correlation between the two events........

Any of you electrical experts know of anything else I should check? I never did confirm that I have 12V to the gauge. Guess I ought to do that before I start pulling the cluster out.

[Ed Jennings]

Addendum

Got voltage at the gauge, still no go. Any recommendations as to a source of a gauge. I really don't want to tear this one out and send it off for repair and return at some unspecified time in the distant future.

[Wayne W.]

Re: Addendum

To test remove the wire. Open circuit, then ground the wire. You should get full deflection.

[Ed Jennings]

Re: Addendum

Essentially, that's the test I did. No deflection, no even a whimper.

[Wayne W.]

Re: Addendum

OK, now you need to go to the corresponding terminal (green wire) at the guage and test ground it there. This will tell you if there is a wire problem from the guage to the sender.

[Ed Jennings]

Re: Addendum

I probably wasn't clear Wayne. I did test at both spots to eliminate the wire, (dark blue on a C1). I'm pretty certain the gauge is toast, just wanted to see if there was anything else to check before I replaced it. Thanks anyway. If you think of something else, please let me know.