1966 C-10 Short Step
I just moved my gas tank from behind the seat to the rear of the truck. That went well. I installed the sending unit and grounded the unit to the frame. I ran a new wire from the new sender to the fuse panel and plugged in the wire to the panel. Worked good. I added a few gallons of fuel to make sure the sender worked properly before I reinstalled the bed wood. I moved the truck to the opposite side of the garage and the gauge went to full and stayed there. Tank is approximately half full. I went to the fuse panel and noted that the bottom screw to attach it to the firewall was missing. I inserted a new screw and as I tightened I the gauge worked again. The went to full again and has stayed there - almost like the whole system is grounded.
My question is - is there some form of insulator that goes under the fuse panel - like a spacer or something?
1. The wire from the sender does NOT go to the fuse panel. No no no nono NO! The fuse panel has nothing to do with the sender, just the gauge. If you have hooked up voltage to the sender, you have fried it.
2. How did you ground the "unit"? What did you ground?
3. Hold on with this until you explain ALL the wiring. So we can understand, explain and help.
Basic sender/gauge wiring:
A short wire from sender mounting flange screw, or metal tab, to a clean metal spot on frame.
A long wire from sender center tap to the sender terminal on gauge.
A keyed fused hot wire to the voltage terminal on gauge.
A method to insure gauge ground is grounded to dash structure.
A continuous ground path from gauge ground plate/frame/feature to the battery negative post.
A continuous ground path from the sender ground spot to the battery negative post.
