starting/electrical issues

[jondee86]

To be fair, throwing bigger cable at it is not the best way to solve this
problem. The important thing is the total resistance for the circuits...
battery positive to starter, and engine block to battery negative. That
plus the cranking amps will determine the voltage drop while cranking.

As you have stated, there are plenty of 4Ga installs that work fine. So
if your starter is in good condition and your battery is fully charged,
check the voltage at the starter while cranking. If you have 10V or
better, the 4Ga is not the problem.

Then you need to check that you are getting a full 12V at the COR
while cranking. If there is a bad (high resistance) connection on the
keyswitch power supply, or a high resistance ground, the voltage may
drop low enough during cranking to prevent starting.

Cheers... jondee86