I bought this truck with around 80k miles on it, in great shape, new battery.
Drove fine for a long time, up over 120k miles somewhere I started to get some failing parts, nothing unusual in my opinion. Alternator stopped charging the battery, low voltage with meter and IIDTool. Replaced it with a reman unit from Autozone, 9/9/2017. Did a road trip across the US and after getting back to the daily grind, alternator not charging again. Replaced it under warranty 11/22/2017. This alternator looked brand new, I was happier.
I noticed through some other brake and ignition coil repairs that the IIDTool was reading 15-16 VDC output on the alternator at times, over the past couple weeks. I was worried, but tried to ignore it until I saw a message from the vehicle diagnostic system. Plus I had/have other things to fix on the vehicle.
Today I have a battery light, 4/16/2019, around 135k mile. Check the codes with IIDTool and I'm at around 13.7 VDC , which it is usually 'healthy' at 14.2. Code is alternator field circuit, I'm assuming it's pushing AC voltage after some diode failures or something, since I was getting excessive voltage before.
So, now, this appears to be my 3rd failed alternator. Can I chalk this up to re-manufactured garbage? Have any of you had 'excessive' alternator issues with yours? During replacement I noticed that the alternators are rated at 150 Amps, but the test slips supplied with the alternator only show tested to 145 Amps.