1994 Dodge Caravan voltage is high after recent altenator r

Tiny
CHICKENHAWK
  • MEMBER
  • 1994 DODGE CARAVAN
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 170,000 MILES
My 1994 van was needing to get jumped quite a few times so I replaced the altenator with a rebuilt 90 amp altenator. After driving about 160 miles I noticed one day while leaving a parking lot that the 'check engine' & 'check gauges' lights were on also the voltage meter was pegged at 18 volts. When I looked under the hood the belt appeared to be fine. When I got back in the van and revved engine the voltage meter fluctuated, then went to 8 volts and the engine died. Assuming that the altenator was the culprit, I had some one help me get it started( I don't know exactly how, he said he did some proceedure to trick the brain). I also discovered that a 15A fuse in the fuse panel under the hood marked engine control was blown, so I replaced it.
When it started again the voltage read 18volts again. So he used a altenator tester that said the amperage varied from 0 - 70 amps and the voltage varied from 15 -18+ volts.
So I replaced the altenator with a replacement from the same store, telling him that I had been given a faulty unit. After reinstalling the altenator, and re-replacing the fuse, it went to 18 volts again, so I don't THINK that this altenator is bad. I've looked for a voltage regulator in my car repair manual but I have'nt found one. Please help me get this van running again. Thank You!
Thursday, April 16th, 2009 AT 2:59 PM

1 Reply

Tiny
JAMES W.
  • MECHANIC
  • 2,394 POSTS
The only other thing that can cause thr problem you describe is the power control module. This will act like a voltage regulator and overcharge the system. I should be on the firewall by the master cylinder.
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Thursday, April 16th, 2009 AT 3:36 PM

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