Crown trucks have a higher current load running through the switches than most other mfgrs. I am not saying it is a bad idea but over time the resistance across the switches can increase due to carbon buildup across the tips. check your micro switches for resistance. I have found any more than a ohm or two can cause all kinds of problems. You should be reading close to 0 ohms direct across the switch. The 20 MT is a very good unit for what it was designed for. Sounds like the pm guy is at least trying to solve the problem.
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