need help with gas guage please

[hotrodder]

I have a 65 GMC . Could someone tell me what color the wire is that supplies the power to the gauges. and also what color is the wire for the gas guage sending unit. It appears some of the wires have been cut where the plug is at the back of the dash.

[PGSigns]

This thread should help. http://67-72chevytrucks.com/vboard/s...d.php?t=378484 Also if you go through the FAQ section there are other threads on wiring.
Jimmy

[hotrodder]

Thanks for the reply. What I have been struggling with is trying to figure out the wires that go to the connecter that plugs in the back of the dash. I had to rewire the truck and I don, really understand the printed circuit. Wish it was just the old fashion guage

[ray_mcavoy]

Chevy trucks used a pink wire for the +12V switched ignition feed to the gauges and a tan wire for the fuel gauge sending unit. Wire colors for your GMC might be different though ... I don't have a GMC specific wiring diagram handy to check.

Here is a good write-up explaining how to test the fuel gauge --> http://6066gmcguy.com/Electrical-02.html

And this paragraph in particular from that site might be helpful to you concerning the connector on the back of the dash:

Check the plug on the back of the gauge panel, check the incoming side at the post lettered "D" & "E". "E" should be power to the dash, "D" is to the sender. Check the printed circuit board on the back of the dash, (GMC Only). Look for brake in the printer on circuits. Repair anything found bad.