Thanks for the info! Question, how does one go about bypassing the starter relay? Adding a wire jumper? Read something about jumping 85 to 86 or something like that. appreciate the help!
Dannyo
Did you make any progress? I just experience this same issue a few days ago. Took the battery off to get it tested and all is good. I have not start , no cranking. just one click. 2019 Yukon XL. I only have about 66k miles. So no corrosion on cables at all.
Dannyo
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