it's pretty easy...
install a switch in the car - connect the ground to the...ground. then the switch will have 2 other leads. connect the power supply to one (12v) then the positive cables for the washer nozzle lights to the other lead. and obviously ground the neg. cables on the washer lights. the switch is usually labled, which lead should be "hot" and which lead should go to the source, but at worst case you can try either combo, u can't hurt anything. hope that helps.
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