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Excursion low batteries??
Our truck just recently began not starting on try. We try immediately again and it starts. This has only happened 3X so far. I search the forum and found several things to check. I have a FICM from swamps, the oil cooler was replaced and several of the updates done while my mechanic was in the engine that deep. I have the Edge CTS and this is what I found:
FICM was 48.5v-49.0v off, just started or running.
ICP was in the 500's right after starting, and in the 900-1000 range while driving around town.
Voltage was 11.9v while off, dropped as low as 8v while cranking, it goes back to 11.9v to 12.2v while running.
The batteries are a little over 2 years old. I'm in Florida and it's summer, there is nothing cold going on around here but my AC. I'm running Interstate Mega Tron Plus MTP-85's. 850cca and 1000.
I read about the 7 pin bargman trailer plug can have a bad ground and drain the batteries. That seemed similar to my issue as the longer the truck seems to sit the slower it cranks.
I unplugged the trailer harness at the back of the truck and then checked the battery using the CTS. It was still low, dropped to 8.5v while starting, but after driving it around for awhile, it climbed up to about 13.3v and when I came to a stop it would stay around 13v. I used a multimeter on the batteries and each had about 12.5v I started the truck again, waited a bit, then checked them and each had 13.4v
So my question is Am I on the right track? It looks like I had a short in the trailer harness, so I should replace it. I'm hoping that I didn't hurt anything by running with the low voltage as I'm not sure how long this was going on before the truck began the no start condition. Should I charge the batteries or let the alternator deal with it?
Sorry for the novel, just trying to give the info that I know currently. Any help or advice would be appreciated. Thank you,