Idling RPM drops with headlights on
I have '72 911 S with MFI.
The idling rpm drops 300 or 400 rpm when headlights on.(1000rpm to 700rpm)
Replaced the batteries four years ago, but its voltage is around 13.5V. I think they are OK?
Please tell me the reason you suppose about the idling drop.
Appreciate your help.
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