On the gmt900 l92 from the factory from the battery, they have a thick cable going to the head and a thinner cable going behind the front bumper.
Its been like that for the last 312,000 miles with zero issues lol
I already added a new oem ground strap from firewall to the head but didn't make a difference. Added it to a different location and doubled it up with factory old ground as people seem to recommend around here. And there's no direct to block ground that I know of on these.
UPDATE! I hooked a 1 gauge jumper cable from the battery ground to the firewall ground and it started right up. I then disconnected it and it's constantly starting normally now but I still have about 1.25v of voltage drop at the firewall ground when starting. I'm thinking of adding a ground...
The voltage drop test shows that there's a ground issue. The starter casing is how the starter grounds... There's no voltage drop across the 12v terminals.
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