unplugging one motor won't screw anything up. I've deleted my headlight wipers too. I even cut the connector off and trimmed up the wiring to tidy things up. There is actually a little rubber plug available to plug the hole in the reservoir where the motor was...instead of using a screw.

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Streetside: 1987 Mercedes 300E Petrol Blue/Green
2014 Ford Mustang Grabber Blue
1999 Ford Ranger Green

Dockside: 1968 Eltro 17
1985 Silverton 34C