I tried put the e-unit in the Jr motor and followed the Diagram carefully. When I tried running the motor all I got was a light and a cycling e-unit. Motor did not run? I checked the wiring to the diagram. I had it correct. I decided I’d try new new e-unit. Again I double checked my wiring back to the diagram that Terry sent. It’s correct. Tried the motor again and got a red light on the MTH Z4000. Went back to the diagram, again it’s as shown in the diagram???
I’m not stupid. It’s the E-unit gods are against me. Maybe the gods are good friends with the X-wife? But somethings not right here. So far it’s E-units 4 me 0. Sense the first e-unit I tried didn’t short out I went back to that one. As I removed the new e-unit and grabbed the unit to pull it out I grabbed the hot e-unit coil solder and cooked my thumb. At the time I thought maybe it’s time for a large hammer! Once the thumb felt better I put the old e-unit back in, double checked the soldering, connections, diagram. It’s good. Put the motor on the track and put power to the motor. Again I had a light, e-unit cycling but no movement? Got a flashlight and watched the e-unit drum rolling? WTH. I tapped the top of the E-unit a couple times and the motor took off like a shot. I turned off the power. Got the motor back in front of me and turned the e-unit arm off to see if it will still run. Nothing. I tapped the top of the e-unit again and the motor went the other way. But the arm is in the off position. I kept tapping the top of the e-unit and the motor would change direction However the motor does not keep running very long. The drum and fingers I installed are maybe 10 years old so maybe they need to be polished.
I gave up. Put the motor back to forward only. Went inside and got another cup of coffee.
Sometimes things just need to be left alone and come back later and you may see the problem.
2020’s been a hard year!