65 C-10 electrical problem

[don adams]

my gas gauge pins itself to the full as soon as you turn on the key, i have replace the gauge, still does it, i have disconnected tank wire, still does it, i have removed the instrument cluster, and just hooked up the pink wire and as soon as i ground the gauge it does it. are both gauges bad or am i missing something DON

[franken]

Sounds like the sender provides a varying resistance to ground and its always grounded. Time to figure out what's doing that.
A voltmeter is your friend here...

[don adams]

thanks,but i finally figured it out, the wire going to the sending unit was broken problem solved THANKS DON

[Beltfed]

Note of interest: The simple test for this problem is to remove the sender wire from the gauge. This will send the needle full or empty, depending on what car you are dealing with. Then take a piece of wire and ground the sender wire. This will send the needle to the other peg.

[63 & 64 Bowties]

Just a heads up for both of you.... you're posting in the Welcome area of the forum where you're not gonna get many answers.
Next time, post in the year specific sub-forum area.
For 60-66, here: http://67-72chevytrucks.com/vboard/forumdisplay.php?f=6
and....
to you both!

[1ATony]

Thanks for joining
Tony