I have a 2001 Dodge 3/4 ton 24v truck. It has a little over 149k miles on it.

Here's the issue:
I started the truck this morning and it didn't want to start all the way. So I let it sit for a minute then it fired right up. Dropped my daughter off at school and headed off to work. Got about a mile from home and the check gauges light came on and the battery gauge was pegged all the way over to 18 with the dash lights flickering some. Pulled over as soon as possible & checked the codes by turning the key. Pulled code P1594. Turned around came home, checked it w/ my OBD2 reader and it didn't pull any codes. I can't seem to find the code anywhere. Talked to another friend and he seems to think that regulator went out.

Any ideas. Usually hubby would check it, but he's at a field exercise training right now with no cell phone service.

 

Not able to find the code, but you might have a short somewhere in the system, but regulator is a good bet. Hope it is a simple fix. Good luck, and let us know what the problem is.

 

P1594 - Charging System Voltage Too High - Battery voltage sense input above target charging voltage during engine operation.

The voltage regulator is part of the PCM, not serviced seperately. So hopefully this was just a freak occurrence and not a sign of something going bad.

 

Well, I took the truck over to the local parts shop where the owner of the business drives a diesel also. Checked the battery, terminals are clean very little corrosion and checked the voltage and its holding very well at 12. He can't think of anything else it could be doing. It hasn't acted up again so I'm just gonna keep an eye on it until hubby comes home.

 

Check the wires coming off of the back of the alternator. I had to add some plastic loom to one of the wires because it had rupped on a bolt back there and contacted.