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12-Volt Wiper Wiring -Try This
OK. let's try this to close out 2020;
A. You need the stainless version of the motor. The other universal version does not seem to have an autopark when you control it from an external switch.
B. I'd suggest you use the single wiper switch. You want both wipers to run at the same time I'd guess. Stay simple
C. Here is a wiring diagram - you may have already tried this, if so I apologize, The switch is just an ON-OFF switch in this application, so if you have the stainless wipers you can just connect the B terminal to ground to test the idea.
D. You can take power directly from the battery, the Accessory terminal of the ignition switch or the Ignition terminal if you have installed a three-way ignition switch.
E. I'd fuse it with a 4 or 5-amp fuse, Speedway recommends a 2-amp fuse for a single wiper, so the pair need a bit heavier fuse.
Let us know how this turns out. Happy 2021!