I believe the original switch is grounded by it's mounting bolts. It has a metal housing. If that is what you have.
1. The switch has two wires.
2. The motor has three wires.
One motor wire is hot from a power source. (brown) (Keyed hot I think). The other two wires are Hi and Lo. (WHT and BLK). It seems that the original switch grounds those wires from the motor to it's housing and thru to the dash/chassis. For Hi or Lo. So the aftermarket switch may work. It is designed to have a hot lead to it and distribute power to it's other terminals for Hi or Lo. So instead of supplying power to it's hot terminal, you would ground that terminal. Then wire it's other terminals to the two motor wires. The third motor wire is wired to a hot souce as original.
Of course, any rotary switch with three terminals can be used if it shows continuity from one terminal to each of the other two, separately. I don't think you want a switch where terminals are all on or all off.
You can test your motor with key on, touch each of the two to ground, one at a time and see if you get a Hi and Lo speed. The two that you are testing are the ones that went to the original switch. The hot motor wire should still be wired to an original power source.
The 60-63 wiper switch is less expensive. It is a one speed.
Others can review, comment, refine.
Last edited by bartamos; 08/26/2025 8:52 PM. Reason: clarification
