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Thanks to Chas Clark and Jaems for the info.
My oil temp unit doesn't have a Green/Black wire on it. It has no wire on it. Upon further digging, I found a Green/Black wire on the primary side of the coil (the +12v side). ??? Any idea what this wire is? Is it the oil temp wire that the PO connected here?
Chas' wiring diagram doesn't show any green/black wire on the primary side.
How do check it?
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