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Nick, if my second post came across as correcting you, I apologize. A correction was not my intention.
My intention was to prevent Keith from possibly purchasing a sending unit and/or gauge because of incorrect info.
There are, indeed, several common configurations of gas gauge circuitry. But Keith is working on a 79 CJ, and the web article I referred Keith to is specifically for CJs. My second post in this thread is valid only for mid-70s to 80s CJs.
That said, I do admire your technique. It is very ingenious. I wonder, given all the oil, temp and gas gauge related questions one sees on these Jeep boards, how many people realize that your potentiometer technique would be equally applicable to trouble-shooting those gauges as well.
Numbers aside, you have made people aware of a very good trouble shooting technique.
Regards,
Inspector-G
PS: Before somebody chimes in with the difference between a potentiometer and a rheostat. I know that a pot is a three-terminal device and a rheostat is a two-terminal device. No practical purpose would have been served here by drawing that obscure distinction.
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