My 1990 ST still has the original RR and alternator, and usually shows a steady 14.1v. Lately I have noticed the voltage fluctuating 13.9 - 14.1 at idle, in time with the idle itself fluctuating up and down a little. Once moving, the voltage is rock steady at 14.1v. I have just fitted LED headlights and the change sort of coincided. Is this normal behaviour or should I be suspicious eg of the RR?
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