I’ll admit I don’t think I really understand the relationship between the batteries, alternator, battery temp sensor, pcm and the check gauges light. Yesterday I was doing a heavy pull with my winch, on 30 seconds off 30 seconds, and my check gauges light came on. The volt gauge was below 8, and I waited a min and it ever came back up. I assumed I’d blown my 200 amp fuse between the alternator and battery. I checked the fuse and it was fine, looked at the gauge again and it was back to charging (so 3-4 mins between check gauge warning and normal charging again). Every component in the charging system is in new/better than stock condition. All positive/ground cables are new, all terminals new, @W-T mod with parallel grounds, 4 gauge b+ cable, 200 amp fuse, 2 new batteries 3 months old and tested. Nations 180 alternator.  Grid heaters were not cycling. Ambient temps around 45*. So was the pcm giving a command not the alternator not to charge for a minute, or was the heavy pull getting the batteries so low it just didn’t register? I was watching the gauge closely and when it dropped below 8 it seems to do it instantly which is why I thought I’d blown the fuse.  Again, it was a heavy pull but with my ****** blocks I had a 4:1 mechanical advantage that put me well within the specs of the winches rating. 

I carefully reviewed my post for spilling errors before I posted I kneed to be a bit more kareful.

39 minutes ago, W-T said:

I carefully reviewed my post for spilling errors before I posted I kneed to be a bit more kareful.

 

 

There is a app called "Grammarly" it helps.  I'm guilty too...