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Old 11-07-2016, 09:48 PM   #1 (permalink)
Gear Grinder
Join Date: Nov 2016
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Charging Problem

I have an 07 2500HD
Have had a charging issue for several years. Been doing mechanic work most of my life, but can't get to the solution.
Dealership changed computer then they burned out my alternator so I replaced it.
Mostly colder weather affects it. Start up, battery never starts charging. Not the alternator, not the once a year set of batteries I've replaced the last three four years, obviously not the computer.

What I do know
Turn key on, glow plugs time out, start truck.
Once truck is running, if cooler temps, grid heater comes on to meet EPA emissions. While 75amp draw of grid heater, computer won't allow alternator to charge due to excessive draw. Once that times out, grid heater goes off, alternator starts charging.

Now here's the problem.
Randomly, sometimes more often, alternator never starts charging and batteries drop to 10 volts and system failure begins.
There is something NOT allowing the alternator to start charging. Could it be an emissions issue? I've been told possibility of glow plug module. It is not a short or bad ground. It will also occasionally do it in 80 weather.
I do now have two glow plugs that are needing replaced. Truck has 280k miles, been a problem since 120k miles.

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Old 11-08-2016, 12:42 PM   #2 (permalink)
R.I.P. Sam
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Post moved out of 6.2 section.

1987 6.2l Jimmy , being restored,4" lift, 35 mudders 1993 W350 5.9 , custom stretched cab, duelly flatdeck
2001 VW TDI Jetta 4 door loaded 2001 VW TDI Golf 2 door swapped engine project
Originally Posted by 4320diesel View Post
well to make your pump retarded, you could let it hang out with me for a day
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Diaric wins thread derailment......
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Yeah Diaric, I gotta say, I'm afraid I'm going to have to give you an official warning on that.
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