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Got a 68 with a 327 and HEI dist. There are times when the gen light comes on and the car runs crappy no matter what rpm. The gen has the internal alt in it I am told. I can sit in the driveway and all is well till the light comes on...it will then run rough or die....others times the gen light will go off and all is well.

You guys are good...tell what to do

Gary
 

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Gary, start by getting the charging system checked. Stores like AutoZone , Advance, and others will check for free. If your voltage regulator is internal, it is built into the alternator. If it is external, it is on the radiator support on driver side. Also, check the alternator belt to make sure it has a good surface and isn't slipping ... If this all checks out okay, or, if you replace these items and the problem continue, ther emay be a problem in the ignition system ...
 

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This may be a chicken and egg kind of deal. The alternator light may be coming on because of an engine problem that drops the RPMs to the point that the alternator can't keep up.
 

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Gary, If you don't have a voltmeter on your car, get a multimeter and measure the volts going to the distributor when this problem occur. Dave is right that your light will come on if the rpms get too low, but you did say that the engine runs crappy at any rpm. I took that to mean that the light was staying on at any RPM ... If you HEI is not seeing sufficient voltage you will have problems such as those you describe. That's why I think you should verify your charging system, then look at your ignition system if the problem persists. BTW, make sure you take the time to check for frayed wires and corroded connections. And, elecrical components can be affected by heat. Does this problem occur when the engine is cold, or, only after it has been running for awhile?
 
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