I have gone back to a project that I have asked you about previously, Don--installing a new S-W water temperature gauge in my 35-year old Pearson. (My first attempt got miswired and I got a big puff of smoke. Assuming that I had probably fried the new gauge, I bought another new from you.) I wired up the new gauge and it is getting power, the sending unit is producing current which I can read at the gauge--and nothing happens. The gauge remains pegged at 240 (it moved slightly the first time I used it from about 220 to 240 and remains pegged there). At your suggestion, when I could not get the new one to work, I tried to put the original gauge back in (which had seemed frequently to be giving false readings). Now it doesn't work at all.
I don't see how the positive and negative/ground leads could be reversed. The lead to the "I" screw on the gauge comes from the oil temperature gauge, like in your wiring diagram. The wire for the "G" screw on the gauge connects to a negative wire that leads back to negative buss. Do you have any suggestions? Are there checks I can make with a multimeter to find the problem? I'm stumped.
I don't see how the positive and negative/ground leads could be reversed. The lead to the "I" screw on the gauge comes from the oil temperature gauge, like in your wiring diagram. The wire for the "G" screw on the gauge connects to a negative wire that leads back to negative buss. Do you have any suggestions? Are there checks I can make with a multimeter to find the problem? I'm stumped.
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