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What does it do if you ground the tan wire at the sender?
You should actually try to use a test light with it unplugged, (tan to ground, through the test light) if possible.
I see, thanks. Do you know if the black wire is a good ground? Does it go down to the E mark when jumped?
It sounds like it could very well be the sending unit, however there is a test for that to be sure.
If you accept my additional service request for your email address, you can give me your email in a private info box and I'll send you the test instructions in a PDF file, the file is rather large.
You will just have to accept the additional service offer and ENTER your email address in the “ENTER CONTACT INFO” section so that I can see it.