recently my xj died while driving, after cleaning all connections, grounds etc, new battery, and new alternator, im coming to the conclusion that the voltage regulator in the PCM is no longer working, and since i dont have $250 to drop on a new computer i am going to bypass it and install an external voltage regulator. I have already purchased the regulator (pt #VR733, from 85 dodge pick up) and have the plug. Now my question is where do u tie the two wires from the plug into on the alternator? Has anyone else done this? pictures would be very helpful. Need to get this going ASAP! Have to drive it to work on monday!! THANKS!
ok this is what im looking at...looks like someone else has been in here before, dont mind the red and black wire they are my 'uneducated' guess at this hook up for the regulator. now which is the green/orange
it will run right now but as soon as the battery drains its dead. i know i probably shouldnt but i removed the battery cable from the battery while running and it shut off immediately leading me to believe its the alternator however, the alternator is new. and after what ive researched looks to be that some people have been having this same issue and it was the voltage regulator/pcm, if i had a spare pcm to change out that would be the best way to find out if it is in fact the pcm. but i dont have a spare lying around. i couldnt imagine what else it could be since everything is new, no blown fuses, and the grounds and connections have been cleaned
ok before i go cutting wires.... the red wire in my picture is the wire running to the ignition terminal , and the black wire is running to the field the regulator is bolted on with a ground, now tell me if im wrong but if i just cut the dark green wire (not the DG/OR wire) then that should be correct right? or is it necessary to "splice" it?
well instead of cutting wires i bent the prong on the connection out of the way and taped it up. however it seems that its still not working properly......after starting, the jeep should be able to run off the alternator correct? its not. im not getting a check engine light, battery light or anything... i suppose ill take the new alternator back off tomorrow and go have it tested.... any other ideas you may have come with them. im stumped and dont have the money to take it in somewhere or get something else.....
The jeep will not run on just the alt, hell it wont run with a bad battery that puts out less than 12v...even if the alt is working.
I would check my running voltage at the battery and at the alternator.
If you dont have a VOM to check your voltage, then crank the motor and touch a screwdriver to the center of the backing plate. (the "bump" right above your field terminals) You should feel the screwdriver stick with magnetic force.
If it does, then the field wiring on the alt is working and it should be charging.
If not, then I doubt you have a good 12v source to the field, probably from a broken wire because it is on the same circuit as the ignition coil.