[Pepi]

Charles, I have never checked or tried, but will he get the full 12v after the gauge with that resistors in it? I can see the volts droping, I don't know by how much. Just trying to learn some stuff along the way also, and you seem very knowledgeable with a lot of this stuff.

[AdamIsAdam]

UPDATE:

Good news, bad news. The good: I know what the problem is. The bad: it's my fuel gauge.

I did the following: plugged the harness into the gauge by turning it 180* (thank you Clay). This allowed me to get power to the gauge, while exposing the terminal for testing.

Clay took an unmounted fuel gauge today and took voltage and ohm readings for me. He got about the same volts coming out as was going in. For ohms, there was about 130ohm on one side (terminal to ground), and about 85ohm on the other for a difference of 45 ohm. Then he took a reading across the gauge and got 45ohm.

On my gauge, I wasn't able to get any constant, decent volts coming out to the sending unitl. Then I grounded that line and the gauge stayed on FULL. Finally, I moved on to the ohms. I got 130ohm on B+ side to ground, and 0ohm on the other side. When I measured across the gauge, I got 0.

So, sounds to me like my gauge is shot. All in favor of that diagnosis, say aye____...

So, my only question now is, who's got a `64 fuel gauge they're not using?