Wiper pulse board parking position reset

[rob249]

Yet another strange thing on my 94' Yukon TBI. Replaced the pulse board for the wipers a couple years ago. When the original board went bad, the wipers would continue running after being turned off, so when I replaced the board, the wipers were mid stroke, assuming the new board would correct it.

Now, the wipers function properly, but they stop about a 3rd of the way up the windshield. I can push them back down to the bottom of the window, and they stay there until I use the wipers again. Whats strange to me, is they still travel the full distance up and down, but return to the middle of the windshield when turned off.

There must be a procedure to reset this stop or parking position. Any ideas?

 

[wirlybird]

I would think this would be an adjustment in the linkage.
I know when I replaced the wiper motor on my Tahoe I had to reposition the wipers and tighten up the linkage so they stopped where I wanted.

 

[rob249]

But I didn't change anything mechanically. All I changed was the controller board.

 

[GrimsterGMC]

Same thing happened on my truck. While the board went bad and wouldn't always turn off, the actual motor had worn also so that the armature wouldn't stop at the moment the power supply stopped, it would keep spinning long enough for the wiper arms to move up the screen. When I put the new motor on I tried turning it by hand and it was too tight to move where as the old one could be turned easily by hand. Haven't had any problems since.

 

[rob249]

Interesting, so you are saying the new motor cant be moved by hand, meaning my motor could just be worn out?

Also, did they sell GMT400s in New Zealand? Didn't realize these were sold abroad. Are they popular there?

 

[GrimsterGMC]

Interesting, so you are saying the new motor cant be moved by hand, meaning my motor could just be worn out?

Also, did they sell GMT400s in New Zealand? Didn't realize these were sold abroad. Are they popular there?

That's right the motor should be tight so when the power stops the motor stops immediately rather than over running as it is doing. No they didn't sell them down here in general but mine was a private import, long before I bought it. There were some that were imported and converted to right hand drive for use as ambulances and they have all been sold to private owners now for camper vans etc. There is a regulation here that if a vehicle is over a certain age it can be registered and driven here without converting it to right hand drive. So there are a small number of them here but with the sky high petrol costs I don't see them out road as much as I used too.

 

[rob249]

Wow, definitely never seen a GMT400 ambulance, I bet its very difficult the convert to right hand. Thanks for sharing that info, didn't know about any of that.

 

[GrimsterGMC]

Wow, definitely never seen a GMT400 ambulance, I bet its very difficult the convert to right hand. Thanks for sharing that info, didn't know about any of that.

Here's a link to one that is currently for sale. https://www.trademe.co.nz/a/motors/cars/chevrolet/other/listing/3725775019
and here's another that has been converted to RHD and is in better condition. https://www.trademe.co.nz/a/motors/cars/chevrolet/silverado/listing/3742806971

 

[rob249]

That ambulance would make a killer overlander RV. For whatever reason, here in the states, every ambulance seems to be Ford based.

 

[AuroraGirl]

That ambulance would make a killer overlander RV. For whatever reason, here in the states, every ambulance seems to be Ford based.

they have a better chassis cab game (ford)

GM oddly dipped out from the segment and gave it up seemingly.