OK, my wiper problem is still going on, I haven't yet had time to delve into it. I'm looking to devote a day or so to going through the various parts.
The good news is this - I have access to another Marauder that does not have a wiper issue. I'm going to see if it's OK to swap parts between them and see if I can fix my issue and recreate it on the other car.
This will really help isolate what part is causing the issue. If I can't recreate by swapping parts that may lead me to believe the issue is in the wiring.
If I do solve my problem and move it to the other Marauder, I'll button things up and tell the other owner their wipers don't work right.
So anyway, Charlie maybe this will help when you get to round 5?