Quote:
Originally Posted by Sirrotica
I've been through this decades ago in a 73 T/A. Don't try to use the frame as a ground, there is too much resistance in the steel that sucks up amps needed to crank the engine when hot. A hot Pontiac engine will need 4-500 Amps to spin over.
Run a negative cable all the way up to the engine same size as the positive cable attach it to a bellhousing bolt near the starter. It will crank plenty fast no matter how hot the engine or starter gets. Every configuration I tried using the car as a ground, failed when everything got heat soaked. Even with a commercial battery and a freshly rebuilt high torque starter (gear reduction mini starters hadn't yet been invented in the mid 70s).
That's my experience, and how I solved the problem, never had another slow crank after running a ground cable all the way to the engine.
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Now this might just work. Are you saying that the frame ground passes marginally enough current when the starter is cold but is insufficient whenever the starter gets hot and requires more amps?