1) I installed a QSI sound decoder and am trying to operate it with the QSI G Wire receiver and an Airwire throttle. It works just fine on track power but won't work on battery. I'm using the Li-ion battery and it meters out at 20 volts. And I did this BEFORE I rerouted the battery wires. Has anyone tried a GP-40 with battery power? Does it work? Is anyone else having battery problems. 2) Well I figured out why the battery plug wires aren't routed thru the holes above the coupler. When you run the wires thru the holes the coupler mounting shaft is in the way. I cut these wires and was finally able to reroute them thru the holes and then solder the wires back together but it took over an hour. I guess the factory doesn't want to spend that much time routing wires. I'm really getting tired of bench testing Aristocrafts locomotives. Any more problems with them and I will send them a bill for my services!