Tried to get some help with a 4wd drive prob took forever to get some help but now have an alternator prob. Truck died tested alternator and was told it was good, bought new batteries, batteries test fine but the alternator is testing at 11v on my tester. anyone had similar prob or know of a fix?

 

jester296,
I have always looked for output of about 13.8 - 14 volts with the headlights on high beam with the engine running. You didn't give any info on the vehicle.
You have a Duramax in your sig but have this listed in the 6.0 Ford section.

 

yeah sorry its on my dads 6.0 with the truck running our tester is showing 11v but he took it into a parts store and had it tested and they said it was fine.

 

I would check all of the connections first. Wiggle and twist all of the wires as you do a continuity check. You may have a broken or corroded wire.

 

thats what we are thinking he is going to take it to a local diesel shop and have it checked out tomorrow.

 

Make sure to let us know what they find.

 

I would bet the alternator is junk. I change quite a few of them.

 

Sorry it took so long but we finally got it in the shop and got it back. The glow plugs were staying on. Changed a sensor and all was fixed. As for the 4wd ? i posted before it was a vacuum switch that went bad changed it and everything is back to normal.