Alternator causing bad idle?

OneSweetWagonOneSweetWagon Band Wagon
in Electronics, Fueling & Air Conditioning
My 89 dpfi idles perfectly until I turn the light on, then it drops to a point where it rattles the hell out of my car. The battery is brand new and the lights dim when the brakes are applied. It all sounds to me like the alternator is going bad but I don't want to replace it if it is something else.

Comments

  • The_HeadThe_Head familEE
    Ain't there some kind of Electrical load detection circuit that bumps the idle up when current demand is high? Maybe that's the culprit, or that may be a later version OBD that has that.
  • canadianbacon52canadianbacon52 Band Wagon
    ya mine was doing that and then my alt. finally quit on me.
  • skinnyskinny Senior Wagonist
    Mine did that. Turned up the idle helped alittle. Had to disable the eld cause my swap had the jap alternator.
  • leWolfleWolf Senior Wagonist
    Yeah, adjust the idle up and see how she does, had that happen on my mitsubishi.
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