Today I replaced the (+) to alternator, (+) to starter, (-) to block and (-) to core support, then to frame. Replaced with 4 gauge wire.
Seemed to be going good, until about 10 minutes of running, then the volts dropped to around 7, back up, back down the went to normal. Done it a few more times over the next few minutes. Had the auto parts guy check the voltage and it was a steady 15(mind you it didn't act up while he had the tester on it.)
So far I have done the following.
1. New battery
2. New alternator
3. The big 3 with 4 gauge wire.