Hello Everyone, I was hoping someone could point me in the right direction regarding a temp sending unit issue in my 72 350. Im not getting any engine temp reading after unwrapping the wiring harness to bypass the resistance wire for an HEI distributor swap. I have tested that the single wire to ground makes my guage spike to hot, and the connector seems to be in good shape. I also replaced the water temp sensor itself but had no luck resolving the issue (and with the timing of the issue it seems to be unlikely to be a faulty sensor as it all worked before). Does anyone have any idea where i could start from here? I am willing to try almost anything at this point. Thanls for your time. Matt
You could check the resistance at the sender to ground then check it after engine warms up. Sounds like you got a sensor for a warning light vs a gauge .
Fiddled with it some more and it turned out to be a combination faulty/incorrect new temp sensor and a loose connector. Used a dental pick to bend the connector contact to fit more snug, no reading. Put the original sensor back in and it worked.
