Howdy

I put in a new sending unit in my 73 charger, and it didn't work..bummer.

Finally got back to it, and I see that it has a dead spot. I tear it apart and find the plastic lining behind the wound resistor wire was melted.

Looking a bit deeper, I find the tank has good ground, and the guage is sourcing 12V. ( 11.4 )

I look a bit deeper, and find the voltage reducer is present on the guage, but obviously it isn't reducing. The Haynes manual shows it to be a simple resistor.

Is there more to the reducer than a resistor? I thought it was unusual for a resistor to fault as zero ohms, don't they usually fail open? Could I have gotten the wrong sending unit?

I disconnected the temp and oil pressure sensor until I get this sorted out. (and the fuel guage ! )