Do we need to use circuit breakers with Window Motors?

If so, how many amps? 20, 30, or 40?

Do we need a Spike Relay, too?

You need either a Spike or a speed controller (Jaguar, Victor, etc). The breaker size should depend on the size of wire among other things, but 20 amps is what we’ve always used with window motors.


I’m curious. If you didn’t use a circuit breaker, how would you be providing power to the motor?

The stall current is actually right around 20 amps. I think the right is slightly below and the left is slightly above. The left one is uses slightly more current because it is slightly more robust as the driver’s side window is used more than the passenger’s side window in most cars.