I purchased the bridge rectifier and installed it, which was easy to do.  Engine is now locked in forward.  Thanks for your help.

Joe

Hello.  I'm new to your board, and I have a question? 

We purchased a vintage Williams engine identified on the box as "GP525 Burlington GP9 Power A W/Horn CAB # 2329".  This engine was purchased for use in a children's museum where I do volunteer work.  It's essential that we lock the engine in forward.

I have modified a few Rev. 4 circuit boards to lock the engine in forward, but, even though one of the boards in this engine looks very much like a Rev. 4 board, the same mod doesn't do anything.   The board is identified as a 247 Category 1 reversing board, Patent # 5,321,344, and 335-X001R2.  This appears to be an engine from the early 1990's when locking into a direction may not have even been discussed.

Would anyone know if this engine can in fact be modified to lock it into forward?

Thanks for any help.

Joe

Hello.  I'm new to your board, and I have a question? 

We purchased a vintage Williams engine identified on the box as "GP525 Burlington GP9 Power A W/Horn CAB # 2329".  This engine was purchased for use in a children's museum where I do volunteer work.  It's essential that we lock the engine in forward.

I have modified a few Rev. 4 circuit boards to lock the engine in forward, but, even though one of the boards in this engine looks very much like a Rev. 4 board, the same mod doesn't do anything.   The board is identified as a 247 Category 1 reversing board, Patent # 5,321,344, and 335-X001R2.  This appears to be an engine from the early 1990's when locking into a direction may not have even been discussed.

Would anyone know if this engine can in fact be modified to lock it into forward?

Thanks for any help.

Joe