A Chrysler Pacifica had 3 of us baffled at my friends shop...
The right front fog lamp stays on with the switch off,key off,and "pulses" rapidly..
The windsheild wiper motor only works at low speed,and the blades can be stopped with barely any pressure..sometimes they wont make a full pass,they sit there and the motor hums...
When the wiper motor is turned on,the headlamps come on by themselves,then go from full brightness to dim,like there is a dead short somewhere..
If you stop the wipers by hand,the headlamps start going from full bright to dim glow again...
My friend knows a junkyard owner well,he lets him "borrow" parts sometimes,and he went and got another wiper motor...
Plugged it in,it does the same thing,only this motor was so weak it wont even work the blades at all,unless you "help" them,and only on low speed..
No wires appear burnt or crossed,the battery will eventually go dead from the right hand fog lamp staying on,but no other "drains" are apparent..
The car was one a customer had up for sale he bought at auction to flip,and was hoping to get everything working "cheaply" so it would bring a higher price..after 3 of us tested all our various theories about bad grounds,stuck relays,etc,with no improvement,the owner had one "customer" who was willing to buy it for 200 bucks less "as-is"...
I think he accepted the offer!...(I wish the next owner much luck!)..