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1990 Other Dodge Models voltage Regulator

Tiny
BADGER0269
  • MEMBER
  • 1990 DODGE
  • V8
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
Hello
I need a little help. I am trying to locate the voltage regulator on a dodge D150 V8. Where is it at?
Is it located on the computer? I think that mine is bad and causing no charge to my battery.
Thank you for all you help in advance
Steve
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Wednesday, June 10th, 2009 AT 7:52 AM

8 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
The voltage regulator circuitry shows to be in the pcm. With everything turned off, is the alternator bat terminal hot?


https://www.2carpros.com/forum/automotive_pictures/170934_90_dodge_1.jpg



With the engine running the field terminals are hot, one is B+ the other has a pulse.
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Wednesday, June 10th, 2009 AT 8:32 AM
Tiny
BADGER0269
  • MEMBER
  • 5 POSTS
Thanks for the info that is where I thought that iis where it would be. I took a DMM to the b terminal and field terminal and I got my battery reading. Then I started it up and got no reading on the dmm at thsoe same terminals. Also after starting it I get check engine light codes 12 (which I have been disconnecting battery alot) and code 41.
IIt is a new alternator and a battery less than 4 months old
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Wednesday, June 10th, 2009 AT 9:20 AM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
I'm not sure which terminals, had no voltage with the engine running? B+ to the alternator field comes from the ignition switch. The other field terminal is ground, pulsed by the computer.
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Wednesday, June 10th, 2009 AT 10:48 AM
Tiny
BADGER0269
  • MEMBER
  • 5 POSTS
I had one wire from dmm connected to the B+ terminal and one cable of the dmm to the field terminal and with vehicle running I no longer got a voltage reading there. Maybe I am missunderstanding how tho check to make sure that the alternator is out putting the proper voltage to the battery.
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Wednesday, June 10th, 2009 AT 11:30 AM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Use separate engine ground, to ground the meter. Test the bat terminal and field terminals one at a time, engine running.
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Wednesday, June 10th, 2009 AT 12:40 PM
Tiny
BADGER0269
  • MEMBER
  • 5 POSTS
Okay I tried that with engine running I got the same voltage at the 2 field terminals and at the b+ terminal it was 12.6 volts+/-. There was no change in the voltage also when I stepped on the gas to increase the rpms.
Thanks for all the info you have given me so far
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Wednesday, June 10th, 2009 AT 3:35 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
If there is no pulse on that one field terminal, it's either the wiring circuit or pcm.
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Thursday, June 11th, 2009 AT 8:24 AM
Tiny
BADGER0269
  • MEMBER
  • 5 POSTS
Thank you for all your help and time. I will look at all the wiring hope that is where its at.
Once again I really appriciate all you help
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Thursday, June 11th, 2009 AT 8:50 AM

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