67 2 Speed Wiper Switch Demystified
Some time back I was disassembling and cleaning the switches from my 67 Dart Convertible #2. All went well till I got to the wiper switch.
Switch number 2820525, 2 speed with the resister on the back
I successfully got the switch open without breaking anything, always a good thing, which was surprising as the pot metal usually breaks where it is crimped. Then I saw the killer broken part (very sad, only thing wrong with the switch)
There is supposed to be a round plastic disk there!
The disk insulates the push button feature of the switch to power the washer pump. Without it the push button shorts out the contact making a short to ground.
Edit: Light bulb time... make a piece! So I 3D printed a replacement part. Not sure how long it will last, but it fits great and is made of some tough material.
As you can see I have a few extra so PM me if you want to test out one on your switch.
But I have gotten ahead of my self...
Once the switch is opened you can see the contact on the inside of the back. There is an insulating board where you can see the mating contacts ride up on in certain switch positions.
The switch consists of 6 main parts
from left to right
The housing
The knob shaft
A double pole contact holders
A single pole contact holder
The insulating board
The back with the contacts and terminals
Nothing exciting about the housing... it has 3 detents for the single pole contact holder and 2 for the 2 pole contact holder
The shaft also not very exciting, a snap ring, a flat for the single pole contact holder and a rounded post on the end to depress the washer contact
Here is where things get interesting...
The double contact holder has gear teeth on the side and a hole in the bottom to sit on a post on the housing. These teeth engage with the single contact holders gear teeth.
The back has some interesting features as well.
#1 is the built in circuit breaker.
#2 is the momentary contact that the stem presses on.
The terminal side is also interesting.
#1 is a terminal that feed power to another device. rather than them running an additional wire that tapped off this switch, go figure!
#2 is the resister that reduces the current flow to slow the wiper motor down.
Some time back I was disassembling and cleaning the switches from my 67 Dart Convertible #2. All went well till I got to the wiper switch.
Switch number 2820525, 2 speed with the resister on the back
I successfully got the switch open without breaking anything, always a good thing, which was surprising as the pot metal usually breaks where it is crimped. Then I saw the killer broken part (very sad, only thing wrong with the switch)
There is supposed to be a round plastic disk there!
The disk insulates the push button feature of the switch to power the washer pump. Without it the push button shorts out the contact making a short to ground.
Edit: Light bulb time... make a piece! So I 3D printed a replacement part. Not sure how long it will last, but it fits great and is made of some tough material.
As you can see I have a few extra so PM me if you want to test out one on your switch.
But I have gotten ahead of my self...
Once the switch is opened you can see the contact on the inside of the back. There is an insulating board where you can see the mating contacts ride up on in certain switch positions.
The switch consists of 6 main parts
from left to right
The housing
The knob shaft
A double pole contact holders
A single pole contact holder
The insulating board
The back with the contacts and terminals
Nothing exciting about the housing... it has 3 detents for the single pole contact holder and 2 for the 2 pole contact holder
The shaft also not very exciting, a snap ring, a flat for the single pole contact holder and a rounded post on the end to depress the washer contact
Here is where things get interesting...
The double contact holder has gear teeth on the side and a hole in the bottom to sit on a post on the housing. These teeth engage with the single contact holders gear teeth.
The back has some interesting features as well.
#1 is the built in circuit breaker.
#2 is the momentary contact that the stem presses on.
The terminal side is also interesting.
#1 is a terminal that feed power to another device. rather than them running an additional wire that tapped off this switch, go figure!
#2 is the resister that reduces the current flow to slow the wiper motor down.