Temp Guage

[Cudatx9]

I'm hoping someone can help me. My temp gauge is not registering. All the engine compartment wiring is new. The under dash wiring has been check. If I ground the temp guage wire at the engine and turn the ignition to the "on" position, the guage will register. I have install two new sending units and get nothing.

 

[moparleo]

What gauge set do you have ? Standard or ralley ?

 

[Cudatx9]

Ralley

 

[moparleo]

Recheck all of the grounds including the main harness block on the firewall. 90% of electrical problems on the old Mopars were ground related. Some times you have to add extra grounds to gauges and lights.

 

[Cudatx9]

Thanks, I'll look into that. I just don't understand how the other gauges, oil & fuel, are working just fine.

 

[moparleo]

Each gauge has a separate ground. Imagine if the connection to the fuel tank sender was the ground !A gauge only works if there is a complete positive to negative circuit. Electricity on a negative ground circuit goes from the positive , through the sender to the ground to make the complete trip. Check power to the fuel pump sender with a test light.
Here is a short read to help you diagnose gauge problems on your car.:http://www.moparmusclemagazine.com/techarticles/interior/23241_instrument_gauges_repair/viewall.html

 

[Cudatx9]

Thanks for the info. I have tried everything suggested on the website you recommended. I have juice to the sending unit wire. I have check for juice at the gauge itself and have juice there(both points). At this point, I am going to take it for a extended drive this weekend to see what happens.

 

[moparleo]

I hate electrical myself.

 

[Cudatx9]

I found the problem was that I was putting teflon tape on the sending unit. It was screwing up the ground. Thanks to all for your suggestions and help. Sorry it took so long to get back. I've been away from the computer for a sometime.