Mechanics

CHARGING SYSTEM NOT CHARGING?

1997 Dodge Ram • 340,000 miles

I blew a rad hose right behind the alternator and I seen my volt guage spike then go to normal, my charging system then stoped working so I installed a new alternator, that didnt work so new battery, that didnt work either, check all fuse's their good! What next?
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Bernicot
August 29, 2011.




Check for power at the main terminal of the alternator with the key OFF. If no power found, check fusible links and maxi fuses. If power found, may have problem with PCM. That is where the voltage regulator is.

Wrenchtech
Aug 29, 2011.
Any applicable trouble codes? Can you communicate with computer? Did you check the generator fuse in power distribution center?

Use a digital multimeter at bat terminal on generator, what does it read, engine running?

JDL
Aug 29, 2011.
I did check the maxi fuses, and no im not able to comunicate with the computer, I dont have access to a code reader, I was able to drive the truck as long as the battery was charged, when the battery dies so does the truck, im going out to check it out with a multi meter

Tiny
Bernicot
Aug 29, 2011.
So I used a multimeter and found I have battery power to the main terminal on the alternator. Thoughts?

Tiny
Bernicot
Aug 29, 2011.
I didn't see wrenchtech, when I posted, he was here first. You don't need us both, have a good day.

JDL
Aug 29, 2011.
If wrenchtech is out of pocket? You don't need a code reader for some codes. You cycle the ignition switch, turn key just till dash lites come on, no further. Cycle the key, on-off, on--off, on, the the mil on the dash starts flashing, you count the flashes to get the codes. Your looking for two digit codes. Example, a code 34 would be three quick flashes, a slight pause, then four quick flashes, get the picture.

JDL
Aug 29, 2011.
No problem, I went to lunch.
You can test but you may have a bad PCM.

Wrenchtech
Aug 29, 2011.
Can I replace my pcm with a used one?

Tiny
Bernicot
Aug 30, 2011.
It has to be reprogrammed to your truck but you first need to positively know that is the problem.
AD

Wrenchtech
Aug 30, 2011.
I checked the code's and got 34 74 1 55?

Tiny
Bernicot
Aug 30, 2011.

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