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Q: idle surge up and down especially with headlights on on 1990 Honda CRX

battery checks 12.45v before engine start...after engine start battery checks 14.19v... if you rev motor up just alittle battery voltage starts dropping slowly down to 12.50v....when engine is warm and with headlights on idle surges up and down if headlights turned off surge stops. please help
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Your voltage readings indicate that the alternator is not working correctly on your 1990 Honda CRX. A low voltage condition when the headlights are turned on could be the cause of your idle surge. Please check connections and proper inputs to your alternator before assuming it is faulty.
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