On the ditch light issue.
Few months after I bought this new engine, it died one day. Sent in. Main board and speed sensor were replaced. When I got it back, noticed the ditch lights. No wig wag now. One comes on in forward direction, one comes on in reverse. Sent back in for a 2nd time for selector switch issue days later. Was told it would have to go back to MTH for programming ditch lights. Already been out for repairs a few months, and it was near the holidays. I just decided to get it sent back home.
Roller meaning power pickup? That's not it. Its something within the drive gears. Wish i had a test stand.