checking gauges
Thread Starter
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Junior User
Joined: Oct 2004
Posts: 74
Likes: 0
From: Queen Charlottes BC
checking gauges
Have a 79 which was someones project before I bought it. My temp gauge doesn't work and I have replaced the wire. Have the new sender but was wondering how to check the gauge itself. Was told they work by grounding but is the sender wire hot?
Thanks in advance
Thanks in advance
Lead Driver
Joined: Sep 2002
Posts: 9,182
Likes: 12
From: Gateway to the West
No, the wire running to the sender IS the ground. The sender changes resistance when the temperature of the metal surrounding it changes. This changes the amount of voltage running through the gauge to ground. If you disconnect the wire to the sender and touch it to the frame of the truck, the gauge should peg all the way over to the "hot" side of the gauge. If it does not, the gauge is bad or the wiring has breaks in it. The key may need to be in the "ON" position before you try this test.
