Dear All,
I am in searching for a solution which switches input power polarities.
Story: My car window regulator (together with the driving motor and the control module) is broken and I've ordered a new one which is a bit different than the original one. The new regulator has no control module, only a motor with 2 power cable (+/-); the car provides a wiring harness has one +12v output and two grounds, depending on the button you pulled or pushed, either of the grounds closed to complete the circuit. The original regulator control module will automatically switch the polarity to drive the motor up or down accordingly. However, the new one has no control module to do this.
Current Planning Solution: I am planning to utilize two relays and two MOSFETs to make such 'Polarity Switch' and here is the circuit diagram I've drawn. I haven't tested it yet (components are on their way from Element14 to me).
Question 1: Could anyone examine my circuit to find out whether it will work? If it does, will it still work if I replace the relay with straight wire?
Question 2: because of the relays, I am really not too confident about the reliability. Is there any other way to complete this 'polarity switching' purpose?
If it helps, the max voltage supplied is 15v (when the alternator is running), the fuse that is used for front window is 30A (maybe it's for both front window), so I assume that the max current draw is less than 30A.
Thanks for any input!
