Have you checked the gearbox on that side? Are you using the exact settings from Clark for your series/lifting capacity? I don't see what would cause that in the wiring for the controllers. You have GE SX boxes I'm assuming. That's pretty generic stuff used by most manufacturers in the US. The wiring hookup is pretty generic too. Make sure you used enough thermal paste on the controllers. Also be careful that you didn't use too much. There is a very happy medium with that stuff. lol