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Help--auto Electricain Needed

Discussion in 'Truck & Equipment Repair' started by kingriver, Jan 6, 2006.

  1. kingriver

    kingriver Senior Member
    from alaska
    Messages: 217

    Cannot figure this out, I own a 1990 Chevy Silver ado 4x4--454 v-8--ext cab. Here's the problem. When I first start it up the amp guage in the dash cluster flucuates--not extremely, and the interior lights flicker alittle. After it has been running 20-30 seconds it stops. I have replaced alternator--didn't help, I have checked all grounds, I have disconnected rear light cluster--didn't help--It has duel batterys, one is new the other is several years old. Could a bad battery create this type situation ?? Could a guy remove (from fuse block) one fuse at a time to try and isolate the problem area ?? Any information on what might be causing this would be greatly appreciated.
  2. clark lawn

    clark lawn PlowSite.com Addict
    from NE ohio
    Messages: 1,233

    get both batteries tested and go from there first. if one is bad i wil cause the light poblems. also make sure starter is working properly if it is sticking a little that would cuase it also
  3. MickiRig1

    MickiRig1 PlowSite Veteran
    Messages: 3,617

    You could have fusible link problems in the wiring of the "run" circuit.When it shuts down is the fuel pump still running and has pressure,still have wipers, heat blower(run circuit)? It could be a lot of things like a relay,ignition switch,fusible link,bad wire or a bad connection.
  4. Plowlikehell

    Plowlikehell Member
    Messages: 73

    Check your grounds, and ground straps.
  5. justme-

    justme- 2000 Club Member
    Messages: 2,138

    yeah start with the batts- never mix batteries in dual setups they NEED to be even in capacity which is not only the size but the age. As batts age they sulfate reducing the internal capacity. a mismatched battery setup can fry the alt or voltage regulator which is in most PCM's these days.

    GM's are known for fuseable link issues, could also be a broken wire. you say the first 20-30 seconds- sounds like when the engine is cold and running roughest to me.