[djustice]

I have had some issues with the wiper motor, 2 speed with recessed park aka hidden wipers for a 73 formula.
Issue i had given up on trying to get the mechanical washerpump working, and have installed a tank with eletric pump on the car and piggybacked of the + and - of the solenoid for the washerpump. This has been working great for several years. Now i got new wiper arms, and installed those but new blades hit the edge of the windshield, so i adjusted the linkage at the motor crank down in the cowl. Sucsess wiper works as it should not hitting edge of windshield trim, but still slams down on the stop post. A few days later i go to use the washer pump, it works , but wipers stop in the park position, fuse is not blown.
I take the motor out when unplugging the 3-prong connector from the motor, the "circut board" that isulates and hold the connector to the motor crumbles to dust. leaving 3 individual connectors hanging of the motor.
I take it down to my work shed and benchtest the motor, suprise! the motor works flawlessly lo-hi-park, i even get the mechanical pump working by spacing the rubber seal on pump piston with a thin o-ring in the same groove as the piston seal.

I grease up the motor and clean it off , i cut up a nylon cutting board and used it as insulator for the crumbled 3 pin connector, crude looking but does it's job. Mount it back in the car and it works for 2 revolutions. I order a new motor from rock auto, and recieved it today. I bench test it and it works flawlessly, i also got a trico eletrick pump to replace the mechanical pump. fit every thing together and mount it on the car. Wiper works, go to press the pump and wiper goes in to hi-gear and promptly locks up. i try to see if the linkage is binding maybe? I try to move the crank arm in the cowl and hey motor clicks and start working again! So i Tougth i migth have over adjusted the linkage causing the motor to bind up, i loosen the 2 screws for crank arm adjustemt so the wiper motor can get the space it wants and turn it on, it works, but when i depress the switch for washerpump motor changes speed and locks up again bind it self, if i touch the crank arm it wil click and start again.

So i am not sure what to adjust next to aviod this.

[Vid]

You’ve certainly done your homework about it. Could it be the switch itself? I hope you find the issue!


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[64speed]

If you’re open to the idea my wipers were like yours. Pain and could never get them right. I bought the Detroit Speed wiper conversion. 7 speeds and washer. Uses a modern motor from I think a GM truck. It’s expensive but it’s a bolt in.

[djustice]

They are aviable for non-recessed park wipers only. But i am sure there is some kind of way to adjust the motor so it does not hang up due to washer pump engagement, just need to wrap my brain around it, maybe adjust in excess backlash in the gears, there is an adjustment for it, but the motor is brand new.

[OG68]

May or may not be applicable in your case but have you verified you have the correct wiper motor drive arm? (determines the degrees or amount of wiper blade travel) There were different lengths depending upon year, motor type, and body style.

[djustice]

No, i have owned This car for over 10 years, and wipers have worked great all those years but wiper blades have always hit the windshield trim om High speed. Bit the new blades Are a modern beam type, and 16 inch long, i have seen conflicting info on length from 14 to 16 inches, migth Get a different set in 14 and re-adjust the linkage.

[unruhjonny]

I wanted to reply earlier, but stayed quiet incase my recollections might have steered wrong;
It was your mentioning of different blade lengths which made me take pause.

Now, I have only had non-recessed wiper cars;
Although recessed wipers were optional for base & Formula models, they only came standard with the Esprit and Trans Am models.

My wiper blades are the OEM trico blades in the original brushed metal housings;
Mine measure in at roughly 18"

I do believe that if you have removed your wiper arms at any time, they need to be reinstalled with the arms at the "rest" position - I have understood that people have messed their situation up by re-installing arms with the armature(?) not in the "rest" position - or by trying to set down the arm to make a non-recessed wiper appear to be a recessed wiper.

[djustice]

Originally Posted by unruhjonny

I wanted to reply earlier, but stayed quiet incase my recollections might have steered wrong;
It was your mentioning of different blade lengths which made me take pause.

Now, I have only had non-recessed wiper cars;
Although recessed wipers were optional for base & Formula models, they only came standard with the Esprit and Trans Am models.

My wiper blades are the OEM trico blades in the original brushed metal housings;
Mine measure in at roughly 18"

I do believe that if you have removed your wiper arms at any time, they need to be reinstalled with the arms at the "rest" position - I have understood that people have messed their situation up by re-installing arms with the armature(?) not in the "rest" position - or by trying to set down the arm to make a non-recessed wiper appear to be a recessed wiper.

You migth be on to something here, I know i said in my original post that i changed wiper arms, that was a brain fart, i ment wiper blades. But i did remove just the drivers side wiper arm and reclocked it but not the passenger arm to help aliviate the drivers side blade hitting the trim on the windshield. And that side is laying down harder on the stop than the passengerside, in my mind that did not matter as i loosend the tension on crankarm adhustment.
I will try to reclock the drivers side wiper arm Tomorrow so that both have the same pressure agains the stop location.
Oh and i did take care to make the motor go into park position when i bench tested it before i put it in the car so everything would line up.

[Held for Ransom]

On my '73, the non-recessed has stainless looking single beam arms and 16" long blades.
On my '74, the recessed has black looking dual beam arms and 18" long blades.

Switch, motor and swing arm, I think, would be different for non-recessed and recessed units.

[unruhjonny]

i believe the switch is shared between the two;
the motor and all moving parts differentiated the two.