Re: Windshield wiper only likes sunshine
Try running a ground wire direct to the wiper motor chassis. Most of the wiper motors rely on getting ground from your hull (total baloney- wrong, poorly designed 'marine' wiper motors). I recommend everyone run a ground directly from their ground bus bar to the wiper motors anyhow - otherwise your wiper motors can become a source of electrolysis (if you use them very often).
We're livin' the good ole days now - smile, laugh, apologize, and when opportunity strikes, hand off your pole.