The windshield washer system on these -70's Bay busses is designed so that you pre-pressurize the fluid reservoir from your spare tire, which pushes the fluid up the steering column all the way to the stalk switches. The washer stalk has electric contacts for wipers, and when you pull it, it simply opens up a valve underneath allowing the fluid the pass through and onto the washer jets.
I have no desire to run washer fluid where all my ignition and steering column wiring is, nor do I want to mess up with pressurizing the washer from my spare tire, so I designed a small holder for a microswitch to replace the valve. Microswitch can be used to control a relay and therefore any electric washer pump.
Tolerances are quite tight as I printed mine with a Formlabs resin printer, but should be printable on FDM machines as well.
Disassembling the fluid valve is easy, it's held in place with just two screws. Retain the black middle piece for the microswitch. I added a tiny spring onto that too for returning it back to resting position once the stalk is released.
Two different mounting hole patterns for different size microswitches. Or just drill your own.
| Washer-SW-Holder.stl | 63.0KB |
