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Blowing 30 amp charging fuse

Tiny
TCOWLES03
  • MEMBER
  • 1991 DODGE DAKOTA
  • 6 CYL
  • 2WD
  • AUTOMATIC
91 dakota 3.9 blew fusible linke replaced with 30 amp fuse still blowing pulled neg clamp on battery put test light between clamp and post test light came on pulled fuses until light whent out (auto shut down fuse lt fender wall under hood)chase that wire to computer on pass side (voltage reg in computer bad)?Also no bare wires found for short to ground
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Sunday, March 27th, 2011 AT 8:59 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,917 POSTS
A shorted voltage regulator won't draw that much current or pop any fuses. It would just run the alternator wide-open. What happens if you unplug the Engine Computer's connector?

A test light in series with a battery cable can be misleading and not very accurate. A better test is to use jumper wires to plug in a 12 volt light bulb in place of the blown fuse. It will be full brightness when the short is present and go out or dim when you do something to remove the short or isolate it.
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Sunday, March 27th, 2011 AT 9:42 PM

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