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91 dodge Dakota 3.9 overcharging #4707564
03/26/18 02:25 PM
03/26/18 02:25 PM
Joined: Mar 2013
Posts: 3,430
southern mo
ram_man Offline OP
ram_man  Offline OP

Joined: Mar 2013
Posts: 3,430
southern mo
Hey everyone. A fellow co worker of my wifeís has a Dakota that has an overcharge condition. They want me to take a look at it . So Iím shopping for info before I dig into it. I havenít worked on an old Dakota in quite a long time. I do believe a shop put a new alternator on it. I just wanted to clarify isnít the voltage regulator built in to the ecm on them? If so wouldnít it be very likely that would be the issue? What else to look for and check? I appreciate all the advice and input.


2014 dodge dart GT
1995 Dodge ram 1500


Re: 91 dodge Dakota 3.9 overcharging [Re: ram_man] #4707651
03/26/18 04:00 PM
03/26/18 04:00 PM
Joined: Oct 2011
Posts: 5,091
USA
NHGUY Offline
NHGUY  Offline

Joined: Oct 2011
Posts: 5,091
USA
Built into the computer.

Re: 91 dodge Dakota 3.9 overcharging [Re: ram_man] #4707679
03/26/18 04:33 PM
03/26/18 04:33 PM
Joined: Jun 2003
Posts: 18,630
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline

Joined: Jun 2003
Posts: 18,630
Deplorable in apple valley, ca
There is a way to add an external regular.


02 Wrangler carlube 5w30
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Z400 castrol T 10w40
Can am maveric edge 5w40
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Re: 91 dodge Dakota 3.9 overcharging [Re: ram_man] #4707705
03/26/18 05:08 PM
03/26/18 05:08 PM
Joined: Jun 2009
Posts: 3,838
Chicago, IL
tomcat27 Offline
tomcat27  Offline

Joined: Jun 2009
Posts: 3,838
Chicago, IL
It's in the ECM. But do a proper diagnosis. On mine when it was overcharging the problem was still with the alternator.


2019 Cherokee, 2018 Jetta, 2014 Sentra, 1995 Escort, 1970 Cougar, 2013 XT250, 2010 Vstar, 2014 CTX1300
Re: 91 dodge Dakota 3.9 overcharging [Re: Chris142] #4707724
03/26/18 05:33 PM
03/26/18 05:33 PM
Joined: Jun 2003
Posts: 34,223
ME
eljefino Offline
eljefino  Offline

Joined: Jun 2003
Posts: 34,223
ME
Originally Posted By: Chris142
There is a way to add an external regular.


This. They're $10 on ebay.

Also check the battery temp sensor under the tray, grounds, and there's an easily corroded main power line junction right under the fusebox on the drivers side fender.

Re: 91 dodge Dakota 3.9 overcharging [Re: ram_man] #4707730
03/26/18 05:37 PM
03/26/18 05:37 PM
Joined: Mar 2013
Posts: 3,430
southern mo
ram_man Offline OP
ram_man  Offline OP

Joined: Mar 2013
Posts: 3,430
southern mo
The guy said it had one on the fire wall. I assume that would be the one they added ?
If so how does that effect the pcm?


2014 dodge dart GT
1995 Dodge ram 1500


Re: 91 dodge Dakota 3.9 overcharging [Re: ram_man] #4707747
03/26/18 05:55 PM
03/26/18 05:55 PM
Joined: Jun 2003
Posts: 18,630
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline

Joined: Jun 2003
Posts: 18,630
Deplorable in apple valley, ca
Originally Posted By: ram_man
The guy said it had one on the fire wall. I assume that would be the one they added ?
If so how does that effect the pcm?
Oh then its not controlled by the ecm.


02 Wrangler carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: 91 dodge Dakota 3.9 overcharging [Re: ram_man] #4707767
03/26/18 06:33 PM
03/26/18 06:33 PM
Joined: Mar 2013
Posts: 3,430
southern mo
ram_man Offline OP
ram_man  Offline OP

Joined: Mar 2013
Posts: 3,430
southern mo
Ok so that should be simple enough to figure out. I wonder if he has it grounded well.
Also he said he had the transmission rebuilt 3 days ago and itís slipping. The shop said it could be the check ball in the transmission line starving it for fluid. I suppose that could happen any thoughts on that? Is that transmission at all computer controlled? I ask because high voltage could play apart in causing issues if it is. Although I thought those had a 42rh correct?
My initial thought was take the transmission back to the guy that did the work. He said when it was slipping climbing a hill he shut it off and then re fired it and it then went ok and quit slipping.


2014 dodge dart GT
1995 Dodge ram 1500


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