Fuel Gauge Bimetal Strip Contacts Arghhhh

[240260280z]

71 240z resto. I cleaned with deoxit bench tested the gauge, installed and it lasted for 20min then stuck open.

I removed the gauge (thanks Escalon!) disassembled, filed the contacts, re-installed, it lasted for 20min then stuck open.

I swapped in the workings from a 280z gauge, did not touch the contacts , it lasted for 20min then stuck open.

It there something I am not doing? Sender is fine at 10ohms to 70ohms. Wiring is fine.

[SteveJ]

What voltage are you using? Are you hooking up the ground, too. The fuel pump uses a voltage divider.

[240260280z]

Stock wiring in the car. I Never removed current limiting resistors...maybe i should have installed one?

On a bench test I used 1 amp 12V wall-wart charger but too little current to run the gauge it would go to ~ 1/2. I did a quick check using battery and got full scale so good to go... and all worked fine in the car but then they danced around and slowly danced to below the F then stopped.