Wiring circuit for relays in the window motor layout

[oldelanman]

Is it possible that there is a capacitor internally in the motor to stop arcing on the com.. which requires an earth?

No such sophistication, the wires are connected directly to the brushes....

[mertkara]

@worzel, relays don?t come out to be short often but if they do, they need to be replaced. Even if there was a wiring issue, I sincerely doubt that your relay will be serviceable now. Anyways, I was looking at the two relays and I was wondering if I could simply use a single relay with two connection and instead of two motors for windows up/down, it would be much cheaper to use a single dual side motor with brakes so that I can measure the current and apply brakes according when it goes up or down.