knighthawk

all gages have been working fine, now I noticed the fuel gage always goes up beyound full. I think that means it's grounded, so even when I unhook the leads in the trunk, it still goes to full, QUESTION; where do I check it under the dash ? If I remember, it has a flat multiple connector....so.... what's the best way here ? which one is power ? which one is the ground or sender ?

Lady72nRob71

If the sender line is open, gauge will read past full.
Short the tan gas gauge wire to ground in the trunk and see if it goes to empty. If it does, then either the sending unit is not making good ground, OR the sender itself is bad.

knighthawk

shorting it to ground akes no difference, still reads full....so.... the wire to the sender is open somewhere ? which wire at the gage can I ground ?

Lady72nRob71

Sure sounds like it.
Pull the gauge and ground the tan one right at the connector (without disconnecting anything), assuming this is a 70-72 A body. You may need a very thin stiff wire to get in there around the tan wire. It is between the gray and blue - it has NO white stripe.

Here is a reference picture:

knighthawk

actually a '69 Cutlass S , I should have said so . wire colors should be the same ?

knighthawk

can I reach up in there and ground the tan wire without pulling the gage to unplug it , ?? with a paper clip or something ?

Lady72nRob71

I think with the 69 the gauges come out the bottom. I do not knowany more than that. The wire colors and positions may vary also.

knighthawk

the gages DO come out the top, and I 'think' the wires were in differnt slots, but the same color...............I'll see tonite, .....thanks