PCM won't charge my battery except for about 3 miles. Then engine starts cutting out and stops

[cow farmer]

I have a 1993 Dodge D350 with Cummins 4X4 with 5 speed. I have to have this truck every day. I have had a shop look at it and try to order a PCM and they said they got wrong one. Shop ordered one from Dodge and they said that Dodge couldn't get one. I have been at this for over a month. I need to move hay ASAP and no truck to pull hay trailer. I have given up on shop and decided to fix it myself. I hate computes on vehicles. I can't decide whether to try and get a remanufactured PCM with uncertanity of its reliability or get a kit to put an external voltage regulator on the truck. My problem in putting in kit is figuring out how to attach to my alternator as it does not have the plug ins as shown on U-Tube videos that I have looked at.

 

[B.G. Smith]

The crank position sensor sends signal to pcm/ecm for tachometer, transmission shift points if automatic and also turns on the alternator. Have you checked that out? Looking at the front of the engine it should be located about 10 oclock on the harmonic balance.

 

[cow farmer]

The crank position sensor sends signal to pcm/ecm for tachometer, transmission shift points if automatic and also turns on the alternator. Have you checked that out? Looking at the front of the engine it should be located about 10 oclock on the harmonic balance.

Thanks will check it out. Alternator works a while and at about 3 miles stops charging. Thank you again.

 

[Ozymandias]

The battery connectors are in good shape?
Both batterys are in good working order, no cell shortage or so?
Check all ground connections around the engine/battery system for oxidizing.

Switch off charging after 3 Minutes seems to me that the PCM sees something wrong and shuts off.

 

[NIsaacs]

Both batterys are in good working order, no cell shortage or so?

One battery on a 1st gen

OP, can you put the pump on manual and at least drive it for hauling your hay? Or fully charge your battery and make a trip?

 

[cerberusiam]

I think you may have a bad battery there. The engine should not cut out and quit after 3 miles if the battery has a good charge in it. They will run 100's of miles on a good battery and no alternator charging. Check your alternator also, it may be the source of the problem after it gets warmed up.

 

[WalterJ]

Morning 'cow farmer'; What got you back on the road? Update pls.