Wiper mot wont turn off

[Texas charger 73]

i have a 73 Charger with a 3 speed wiper motor... i recently upgrade to an American auto wire harness and everything works flawlessly except the wiper motor.... everything is wired correctly, but when i turn on the key the wiper motor runs at full speed... no matter what position the switch is in it runs full speed and only full speed... i tried a different switch i know is good and same issue.. i have pulled switch and externally grounded it and still no change... any other suggestions

ps. when i had the standard dash in it all worked fine. now has a rallye dash

 

[PurpleBeeper]

Just a guess, but are the wires hi/med/low/park, etc going to the correct place? Maybe a wire color on the harness mixed up?

 

[Texas charger 73]

all wires are in correct spot... i even moved wires around and nothing

 

[72RoadrunnerGTX]

Verify again the switch is grounded, had an E-body 3-speed behave as described recently, poor switch plate grounding. Double check the switch to motor wiring.

 

[Badvert65]

I agree with 72RoadRunnerGTX.
Both the switch itself and the wiper motor MUST be grounded. Years ago, I 8custom built a console for my 74 Road Runner. I moved the wiper switch to the console and it wasn't grounded. My results were exactly as you describe. My bet is the switch, but it could also be the wiper motor.
jus sayin....

 

[Nacho-RT74]

wiper motor turns off reversing the spinning sense allowing to a lever system built into the motor to cut the power just on that reverse sense, opening points built into the circuit pushing a tab. To reverse the motor needs also to feed with ground coming from switch through one of the harness wire reversing the power polarity ( DC motors can be change its spinning sense reversing the polarity of the source ) Hence why switch needs to be grounded.

dunno if makes sense what I tried to explain… somehow…

 

[Texas charger 73]

wiper motor turns off reversing the spinning sense allowing to a lever system built into the motor to cut the power just on that reverse sense, opening points built into the circuit pushing a tab. To reverse the motor needs also to feed with ground coming from switch through one of the harness wire reversing the power polarity ( DC motors can be change its spinning sense reversing the polarity of the source ) Hence why switch needs to be grounded.

dunno if makes sense what I tried to explain… somehow…

I'm still thinking I have a ground issue somewhere.

 

[Badvert65]

The switch 'case' needs to be grounded as well as the wiper motor case.
jus sayin....

 

[Texas charger 73]

The switch 'case' needs to be grounded as well as the wiper motor case.
jus sayin....

wiper motor is grounded..