I could use some help here. Two years ago I purchased a Bachmann Christmas Street Car/Trolley. G scale, 17' of track, two bumpers, a MRC Reverse Module # AD 520 and a MRC Transformer # 1370 from a local train shop.
My goal was to place this above our sliding glass doors and have the Car go back & forth along the track via the bumpers & reverse module.

I still to this day cannot get this to work. I found that the Car itself was defective so returned it and got a Bachmann G scale closed street car model 93939 in return.

I have hooked this up according to the directions I received and it just won't go back & forth. If I disconnect the reverse module wires, it will go straight on the track with the transformer at around half power.

I even attended a couple of local train shows to seek advise and was told that the wiring diagram was correct.

So, does anyone have any suggestions as what I might do to make this work? As you can see, I am a complete novice at this. Just would like to have this up for the holidays.  Many Thanks