pcm

chinkboyus · 08-11-2008, 10:49 PM

i have a 97 cummins manual trans and a bad voltage regulator and i was told that it is in the pcm powertrain controll module if this is true how do u check it and what is the next step?

clc · 08-12-2008, 08:55 AM

Try a search on "external voltage regulator".

http://www.cumminsforum.com/forum/search.php

You should find information and workarounds.

And,

__________________
96 3500 4WD, 47RE, gauges; 97 3500 4WD 47RE, gauges; 97 3500 2WD 5-spd; all club cab. 98.5 2500 2WD SB, 5-spd, gauges, quad cab

Last edited by clc : 08-12-2008 at 08:58 AM.

illflem · 08-12-2008, 09:44 AM

The stock alternator is made for an external regulator. The PCM is the regulator normally. The alternator does not care whether it is controlled by the PCM or a regulator. The PCM is not affected by not being hooked to the alternator.
Any 12 volt regulator will work.
Most two terminal regulators have the contacts in the shape of a pyramid. One terminal is missing. The missing terminal and one other terminal are at the base of the pyramid.
Hook the two alternator terminals to the two regulator terminals. Does not matter which goes to which. Disconnect the wires to the PCM and tape them. Now run a 12 volt line from an ignition source to the top regulator terminal along with the alternator wire. That's it except you need a good ground from the alternator to the regulator case.
If you hook the 12 volt up to the wrong regulator terminal, it does fry the regulator.

__________________
Bill
'95 2500 4wd auto
'95 3500 5 speed heavy hauler
Both far from stock

08-11-2008, 10:49 PM	#1 (permalink)
chinkboyus Newbie Join Date: Aug 2008 Posts: 2 chinkboyus's Truck Pics	pcm i have a 97 cummins manual trans and a bad voltage regulator and i was told that it is in the pcm powertrain controll module if this is true how do u check it and what is the next step?

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08-12-2008, 08:55 AM	#2 (permalink)
clc Cummins Enthusiast Join Date: Feb 2008 Posts: 255 clc's Truck Pics	Try a search on "external voltage regulator". http://www.cumminsforum.com/forum/search.php You should find information and workarounds. And, __________________ 96 3500 4WD, 47RE, gauges; 97 3500 4WD 47RE, gauges; 97 3500 2WD 5-spd; all club cab. 98.5 2500 2WD SB, 5-spd, gauges, quad cab Last edited by clc : 08-12-2008 at 08:58 AM.

08-12-2008, 09:44 AM	#3 (permalink)
illflem Moderator Join Date: Nov 2005 Location: Montana Posts: 1,216 illflem's Truck Pics	The stock alternator is made for an external regulator. The PCM is the regulator normally. The alternator does not care whether it is controlled by the PCM or a regulator. The PCM is not affected by not being hooked to the alternator. Any 12 volt regulator will work. Most two terminal regulators have the contacts in the shape of a pyramid. One terminal is missing. The missing terminal and one other terminal are at the base of the pyramid. Hook the two alternator terminals to the two regulator terminals. Does not matter which goes to which. Disconnect the wires to the PCM and tape them. Now run a 12 volt line from an ignition source to the top regulator terminal along with the alternator wire. That's it except you need a good ground from the alternator to the regulator case. If you hook the 12 volt up to the wrong regulator terminal, it does fry the regulator. __________________ Bill '95 2500 4wd auto '95 3500 5 speed heavy hauler Both far from stock