Fixed voltage / cockpit lights surging

[goalstop]

1964 M20E

Volts were fluctuating from 14.5-15.1 while engine was operating. Led to nasty dimming of the lights on a 1-2 second interval

Didn’t work: re-soldering transistor in dimmer panel, replacing corroded master contacter, replacing master switch

Did work: cleaning contacts on voltage regulator ground & power wires

Thought I’d leave this here for the next guy  Check those contacts before doing expensive stuff!!

[wburger1]

Thanks you for the pirep.