[HO455]

Originally Posted by toolboxchev

I found my stock system pegged at maximum amps for the alternator when running all the stock accessories.

A local electrical shop confirmed my suspicions by doing the same current draw check on the wiring harness. He snickered in a comment to me, " Why did GM do that?"

I am thinking the AC relay circuit would also solve some of the problems as it takes the high fan current load away from the dash harness I believe.

GM didn't have a monopoly on that kind of electrical engineering.
With my 70 Javelin if it is driven daily, in traffic, during the winter, with the heater, lights, using the brakes frequently, with the wipers on, the battery will be too drained to start the engine in 4 to 5 days unless I take it for a 10 mile run on the freeway at least once.
The factory 35 amp Motorola alternator doesn't charge at idle and they really are optimistically rated. After testing several alternators and regulators I never saw one that made more than 30 amps.
When these vehicles were designed stop and go, bumper to bumper traffic wasn't a problem to consider. They only work with enough run time on the highway.

Most definitely adding the A/C circuit can reduce the dash harness load since you can pick where the blower power is being supplied from.