Hi Fellas,
I am working on our 1959 Chevy apache 3100. It has a 283 with an aluminum edelbrock intake. When I bought the truck, it already had that manifold installed. The P.O. had a set of aftermarket gauges that were working ok. We purchased a new gauge cluster due to the fact that nothing was working on the old cluster anyway. I got the fuel gauge working and the oil pressure and the amp gauge all working, but the temp sensor is giving me a fit. The gauge goes full hot when you touch the sensor wire to ground. I've tried two different sensors one from parts store and one from Summit racing. They were marked on the box as for a gauge not a light. Using a volt/ohm meter I get zero ohms when touching probes to top and bottom on the sensors. I also used a heat gun set to 220 deg. while holding the sensor over the heat gun and still Zero ohms. Doing this same process with the sensor attached to the wire and holding the sensor on the engine to ground it the temp gauge pegs out hot.
I need the piece of the puzzle I am missing. At first I thot the aluminum intake wasnt providing a good ground, so I attached a wire from the eng block to the sensor and wrapped bare wire around the brass neck of the sensor and pinched it with a steel spacer which should have been a good ground. NADA. Even ran the engine until my hand held temp reader shows 180 deg and NADA on the gauge.
Is there a 30 ohm temp sensor I need like the fuel sending unit? Anyone have a part number? Maybe LMC trucks?
The wires are all new. The P.O. replaced the entire wire harness and I ran new 16ga wire to the gauges.
Last edited by Roadking53; 05/13/2024 9:28 AM.
