When you replaced the alternator, did you also replace the voltage regulator? I have read that on this truck, the voltage regulator is internal to the ECU and is located on the firewall near the ignition coil. You may be able to install a separate, dedicated voltage regulator available at your local auto parts store. Please note that you may have to rewire from the ECU connector to the stand-alone voltage regulator. Good luck.
SOURCE: Crankshaft position sensor location - 1991 Dodge Dakota 5.2L
it is on the passenger side on the back off the motor.there are two allen head bolts or 13mm.it goes into the transmission and normally has rubber at the opening.you should be able to gets this from the top follow middle of valve cover on pass. side the go strait back toward the fire wall.please rate this answer.
SOURCE: Intermittent starting problem/shutdown problem - 1991 Dakota
did you replace ignition madule? I see you chg. everything else but that. they can be fine when cold, but when they get hot quit working.
SOURCE: 1991 dodge dakota sport 5.2 Alternator connector
az alts arnt the best. the volt reg in the ecm. you need to have it tested
SOURCE: Battery loses charge while driving. Won't
It sounds like you have a major compent shorted out somewhere. Some thing is causing a discharge. Therefore your altenator is not responding and the car is draining the battery. Is the circuit between the altenator and the battery broken?? Also, you may need to check all the chassis grounds. Sometimes all your problems can stem from just a bad ground.
SOURCE: Dodge Dakota Battery still wont charge
I was running into this problem with my 97 5.2l Dakota and after some searching I found the the "Fuse Link" between the Alternator and the Battery was blow. Found a suitable "Fuse Link" at a local Auto parts store for about $5.
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