Helpful info. I am testing right after starting the truck. Since you mentioned the glow plug relay....one more piece of information to add. When I am cold starting for the first time in a period of time, the glow plug light on the dash never turns off....no matter how long I wait. However, when...
I'm sure this is possibly an obvious solution, but I wanted to see if anyone had any insight here that I'm not realizing. Both (new) starter batteries read 12.6v with the truck off, truck running, both read 12.6 volt. Engine 2k+ RPM - batteries still reading 12.6v. 0 change in voltage. Wondering...
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