[Ford 1948]

hey guys we have installed a double swith driver single passager side on the driver side the window is super slow up and down when we remove the switch and connect directly it goes up and down fine any ideas boys thanks

 

[Crosley]

Welcome to Hotrodders. You posted a new question to a very olde thread. I moved your question to a new thread for some fresh ideas on your problem..

 

['49 Ford Coupe]

You might have answered your own question.

 

[39 master]

Good grounds and good wire. I would look at your entire ground system first.

 

[cerial]

Wiring and switches not up to the task.
A relay will let you run fewer amps through the switch and supply full 12 volt power to the motor.
I would feed the relay 10 gauge and have it located under the glove box or inside the door. The old switch wiring can remain the same and be used to turn on the relay. Depending on how the switch(s)/motor(s) are you may need 2 relays per side one for up and another for down.

This is a basic answer to all rides that may have a slow motor issue caused by a voltage drop. The more information you can provide the better.