So I had the wiper pulse board problem where they sometimes would not work etc. So I ordered a new pulse board and replaced it. When trying it out the functions do not work like they should it's either on or of and no slower functions, also the wiper wash function did not work.

Did i order the wrong replacement part? Or is there something else I am missing? I checked the part number trough rockparts and it is the correct number.

I attached pictures of the old and new board, I also checked the part number with seems to be correct. According to rockparts this is the original AC Delco replacement.

It's a 91 5,7 c1500

 

I can't say whether you have the the right board or not.
When I dealt with this in my 92 I had to replace the board and the multifunction switch to get every function working.

 

Was the wrong board they send me. So problem solved.