Alternator eater

[Cold Tooth]

I searched the threads and found one instance of a similar issue on a Cummins. I have swapped out my alternator and within three days, it is giving out. It is a reman, but seems unlikely that I got a bad break. It’s the exact same issue as the original. I hav measured resistance on grounds, battery and alternator cable. They are measuring within limits. I am stumped. Anyone have this issue or know of a fix? Battery is also brand new. For good measure, I am going to run new ground cables and a new alternator cable. I’d love to hear your ideas. Belt tension is good. Pulleys turn smoothly. No wobble on any pulleys. Oh yeah, brand new SERP belt. Thanks in advance.

 

[Tl806]

Same thing happened to me. 3 alternators in 5 days. Finally went to the dealer. It was a bad PCM.

 

[Cold Tooth]

This is where I have landed. Truck is at the shop now. I am fairly positive I’ll be following in your steps. Getting my checkbook ready...

 

[ILLXJ]

Had the same issue on a Subie. Got an alternator from the dealer. It's been fine since then.

JIM.