I've had another thread going about this engine. I had wheel slippage ever since I bought it and finally got a handle on it. Most of the solution involved adding more weight and removing the Bull Frog Snot I had on it. Anyway, tonight it was running and pulling real well. Until it didn't. All of a sudden, it seemed like the e=unit ceased functioning. Couldn't get it to move. But then I realized that if I pushed it, it would move, but slowly. I had no choice but to strip it down, remove the e-unit and motor and try to solve the problem.
Here's what I found........the e-unit cycles properly and I do get full voltage readings when I put my meter leads across a brush well and ground and the opposite one when I try to reverse. I have to push the wheels to get them to start moving. I took the brush plate off and cleaned the brushes and the commutator. Added lube (but that was done when I worked on it last week). I checked for loose or broken wires and can't find anything amiss. The e-unit gets pretty warm, but most of them do when run for awhile. I don't notice anything charred or shorted on the motor or wiring. But the motor suddenly lost it's power and after 4 hours down there, I'm out of ideas (at least for tonight).
Any suggestions will be appreciated