by Steve » Mon Oct 19, 2015 12:37 pm
Right. Take the gun WITHOUT a battery. Take a multimeter. Set it to ohms (looks like an upside down horseshoe). Plug the probes into the battery plug. Again, NO BATTERY. Plug the multimeter probes into the port your battery plugs into. There should infinite resistance (no current should flow). Pull and hold the trigger in full auto. Resistance should show up (unless you have a mosfet). Resistance registers when trigger not pulled? You've got a short. Open circuit regardless of trigger, and no mosfet? Check your fuse. If it still doesn't work, I'd take it in to a tech. But, if you can't / won't do that:
While you have the multimeter out, check the voltage and current of your test battery pack to make sure it works. The settings will be "DC Voltage" and current as amps or milliamperes. If the battery is dead, you'll need to replace it and restart your troubleshooting.
Unhook the motor and physically remove it from the gun. Reconnect the AEG to the motor with the motor not physically in the gun. Plug a battery in to the gun. If the motor spins when you pull the trigger, then your gearbox is locked up. The motor can't overcome the resistance from the fragged gearbox, and that is what caused your battery to burn. If the motor does not spin, either your wires are shot or your motor is. Disconnect the motor from the AEG. Connect your motor directly to a voltage source. If it works, your wiring or mosfet or fuse box is bad.
Generally, you should be able to narrow down what is fragged by isolating each component and testing it. For cost reasons, hope you blew a fuse.