Dodge Ram 1500 / 2500 / 3500:

will not stay charged

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#1 6/13/2010 11:59 PM

cloudrepair
New member
Registered: 6/13/2010
Posts: 5

will not stay charged

I have put in a new alternator and battery.  I have looked at every fuse and wire to try and find a loose or blow fuse.
My van worked fine.  I had turned it off came back to get in and would not start I had to get it jumped to start up but would die.  I put in a new starter and still will not stay charged.  I have put in a new battery and the voltage will not go pass 8 and when I turn on lights or try to use any other power inside like heat or air will die.  What else can I try to find the problem?

Last edited by cloudrepair (6/14/2010 12:29 AM)

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#2 6/14/2010 1:25 AM

TechHelp2
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Registered: 11/24/2009
Posts: 1298

Re: will not stay charged

I need more information on you truck?

What year is it?

What size engine?

The more information you supply, the more I can help you.

For a quick check, what is the voltage across the battery terminals when the truck is running? If it is under 12 volts then the problem may be the voltage regulator. The big problem is that the voltage regulator is part of the Powertrain Control Module (PCM). If the voltage regulator is the problem then the PCM needs to be replaced.

Get back to me as soon as you can.

Last edited by TechHelp2 (6/14/2010 1:38 AM)


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#3 6/14/2010 2:37 PM

cloudrepair
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Registered: 6/13/2010
Posts: 5

Re: will not stay charged

91  5.9 L

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#4 6/14/2010 4:43 PM

TechHelp2
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Registered: 11/24/2009
Posts: 1298

Re: will not stay charged

The engine controller contains the voltage regulator function. The engine controller uses the battery voltage sense, the battery temperature sensor, and its own program to determine the charging system's voltage goal. The voltage goal is adjusted by the controller based on changes in the voltage sense and temperature values.

The basic voltage regulating function is to keep the charging system voltage between 12.9 and 15.0 volts. The voltage regulator accomplishes this by controlling the current flow through the rotor. Since the rotor is electromagnetic, controlling the current through the rotor effectively limits the strength of the magnetic field and the output of the alternator.

If you don't have voltage at the field wire at the back of the alternator then the controller is probably at fault. Also check that the battery temperature sensor on the bottom of the battery tray is not damaged.


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#5 6/15/2010 1:13 AM

cloudrepair
New member
Registered: 6/13/2010
Posts: 5

Re: will not stay charged

do you have any info on how to bypass the computer voltage regulator with the voltage regulators they used a couple years earlier maybe year 88

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#6 6/15/2010 12:35 PM

TechHelp2
Administrator
Registered: 11/24/2009
Posts: 1298

Re: will not stay charged

I don't know of any short cut, if you go to a local starter/alternator rebuilder he might know of a way to make the alternator charge internally. I can't guaranty this but it wouldn't hurt to ask.

I found a truck forum with information on this. Check it out.  http://thedieselgarage.com/forums/showt…t=58251ine

They say the problem gets fixed but the check engine light will stay on all the time. No fix for that.

Good luck.
 


.

Last edited by TechHelp2 (6/15/2010 2:03 PM)


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#7 6/16/2010 2:06 AM

cloudrepair
New member
Registered: 6/13/2010
Posts: 5

Re: will not stay charged

thanks the link was the info i needed. worked good thanks again.

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#8 6/16/2010 5:30 AM

TechHelp2
Administrator
Registered: 11/24/2009
Posts: 1298

Re: will not stay charged

Glad we could help.


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