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Re: 1990 buick lesabre help!!
I would look for loose electrical connections at the battery, grounds, etc. Are the terminals good and clean with tight connections? Check to make sure the alternator connections are clean and snug.
Might check the alternator output with a voltmeter and see what kind of voltage it is putting out. Check it at the battery when idling. Then, turn on the radio, heater, some other electrical stuff and see how the load on it changes it. A battery shop would check it for free.
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