Hello, we have a 5FBE18 electric forklift that keeps blowing TMD's. The unit was onsite & someone had damaged the Large Anderson plug for the battery leads, then reverse polarized the unit. The unit was towed to the workshop. We replaced the contacts for the solenoids, both Snubber & CPU boards & a damaged TMD. I have spent a day checking everything out. The only thing I noticed was where the bushes contact the comutator for the drive motor it looks darker than the other drive motor. I can't find anything obvious at this point. All help would be appreciated. Cheers BF