C3500 electrical issues

Asked by Jul 11, 2018 at 09:22 PM about the 1989 Chevrolet C/K 3500

Question type: Maintenance & Repair

I have an 89 Chevy 3500 with the 454. It's relatively new to
me. The battery gauge started pinging back and forth and
the electrical stuff was cutting out on the way home. I
figured the alternator was going out. Then suddenly it all
shut down and wouldn't even attempt to turn. I even tried a
jump pack and nothing. I put in a new alternator and fully
charged the battery which is only months old. Still nothing.
Then I realized that none of the power accessories work
when the ignition is turned on. No fuel pump, no radio,
nothing. I have lights but that is it. There had been some
aftermarket stuff put in like a radio and such by the
previous owner. I don't mind swapping parts as they are
relatively cheap but I'm really not sure where to start. Any
ideas?? Thanks!!

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