My 1994 B250 conversion van has a voltage issue that I can’t find. The meter in the dash fluctuates on occasion from full 13v to low voltage. Thought it was the voltage regulator so I replaced the alternator with a NEW one not a rebuilt. Problem is still there. All accessories were disconnected for process of elimination and still there. Alternator is working fine and the problem isn’t present all the time. It comes and goes as it pleases. Voltage drops considerably under a load Ex. A/C, headlights, ect…

Van runs great otherwise, always starts and never let’s me down. Just blows fuses and bulbs due to low voltage draw. All cables look ok also.

Any ideas????

Thanks
Jay

UPDATE:
Went to mechanic today. Was put through several tests. Everything passes with flying colors. Alt, check, batt, check. Had another mechanic tell me that the voltage on these vans is regulated by the computer. Do I need a new computer? Is there any other test I can do?

 

You could have a bad ground. I know that in some Dodges, the voltage regulator is in the PCM.

 

yeah i would check the comp... voltage reg is in there... or check that system

 

Update:
Had a voltage regulator installed in the new alternator and bypassed the one in the computer. BIG DIFFERENCE!!! Everything is much brighter and I can turn every accessory on without any power drop.

Only issue now is because I bypassed the computer the check engine light is on (must be setting off a code). Nothing that removing the bulb won't fix....


By the way, Had alternator, grounds and battery professionaly checked and everything was perfect.



On to the next problem:
Fan blower looses power at higher RPM's. Not electrical power but air force. Any ideas guys?