Here's some background info on the issue. I have an 04 Tahoe (last year of internally regulated alternators, so it's NOT a PCM issue). My voltage meter rested right around the 14v mark (actual reading was a little higher) before switching alternators. I installed a dual alternator bracket with both my stock alternator and a 370a hairpin alternator from Mechman. My voltage is now at 14.8v and my battery light comes and goes and I get the message "battery not charging".
How it's hooked up: due to length of wires and harnesses, the stock plug is plugged into the 370a alternator and the stock alternator wire is on the stock alternator. The stock alternator has an excitation harness. Both alternators also have dedicated 2/0 runs for both positive and a ground to the case.
I am wondering what is causing the battery light. I am assuming it is high voltage which means it will be impossible to fix. If it has something to do with the stock harness and stock alternator positive wire not being on the same alternator, that can probably be fixed. I was not sure if there is some sort of sensor to check that the alternator was putting out power, or if it is related to the stock harness.
How it's hooked up: due to length of wires and harnesses, the stock plug is plugged into the 370a alternator and the stock alternator wire is on the stock alternator. The stock alternator has an excitation harness. Both alternators also have dedicated 2/0 runs for both positive and a ground to the case.
I am wondering what is causing the battery light. I am assuming it is high voltage which means it will be impossible to fix. If it has something to do with the stock harness and stock alternator positive wire not being on the same alternator, that can probably be fixed. I was not sure if there is some sort of sensor to check that the alternator was putting out power, or if it is related to the stock harness.
