HELP! Overcharging alt

[WEASTMAN]

I am having an issue with my internal regulated 370amp high output alt. I am running dual alts with my stock alt running the truck (04 Yukon Denali) , and the high output alt running my audio. I have a relay to power on my high output alt, my relay consists of power fused from cmaxx Battery positive, chassis ground to relay, switch power from fuse box to relay, relay to alt L on the terminal. When engine is running my high output alt does not charge, even if I attach the s wire from alt terminal to Power output stud of high output alt. The alt will still not charge. The only way the alt charges is if I fuse tap from fuse box to ignition terminal S of the alt. The alt charges but is overcharging at 16.5+. How do I fix this issue?

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[audiobaun 5,000+ posts]

Pull it, take it to an Alternator repair shop and have them test it

 

[WEASTMAN]

Pull it, take it to an Alternator repair shop and have them test it

I brought it to the shop twice, once before replacing the regulator and once after. Both times the shop said there is nothing wrong with it.