70 B-body 3 speed wiper conversion,

had a 2 speed wiper motor factory,
now I need the 3 speed model for air cleaner clearance,

I have a correct, 1970 B-body 3 speed motor installed, as well as a 3 speed switch, but the switch seems to work in reverse!
when the switch is pushed all the way up
(should be highest speed position) the wiper is off,
switch all the way down, wipers run extremely fast.
also, they do not "park" themselves, you have to work the switch a little at a time to get them down to the bottom of the windshield. The 3 speed switch I installed acts like it may be upside down, but it went in the same direction as the 2 speed switch it replaced.

Is this 3 speed switch just messed up?
Is the wiring differnt, 2 to 3 speed motors?
Is the linkage diffrent, 2 to 3 speed motors?

thanks for any response,
KB

kb6996@juno.com

2 possiblilites for the symptom.
The switch has bad or burnt contacts inside and may need rebuilding.
Secondly try checking that the switch casing has a good ground as well as the motor.
I'll put my money on a bad switch as it is 40 years old and needs servicing.
Was the 3 speed motor rebuilt or checked to make sure it functions properly?
Are you sure you have good contact points with all the terminal connectors?
The symptom can also mean that your blue wire is not getting the signal to send the motor in reverse so that it can park.
Have the wires in the connector to the dash switch been fiddled with?
The linkage for 2 and 3 speed motors is the same on 70 B bodies.
You do have to change the cam arm to a 273 ending part number.See pic.
You also need a tan color nylon bushing and not the black 2 speed bushing.
The wiring remains the same.
If you need my services please contact me.
Thanks
Jules

Hi, thanks for your response,
I have another switch I will try,
The wiper motor did work OK on another car,

do you sell wiper pivot seals?
Do you sell the tan plastic cam that I need?

thanks,
KB

"do you sell wiper pivot seals?" yes $20
Do you sell the tan plastic cam that I need? yes, $30
Shipping included.
You will need the arm also unless you have it already.
I do not have any 273 arms in stock right now.
Jules