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→Step 2 - Solder the wires
All you need to do is solder the wires of your power supply to the correct terminals of the VMU. If you're going to directly attach the supply to the VMU, make sure you give yourself plenty of cord length. If you use an extension cord to create a detachable plug, make it just long enough so that the thick end of the cord won't interfere with plugging the VMU into the first slot of a controller with something else in the second slot. With this mod, you will not be able to attach the VMU to the second slot any longer.
All that's left to do is test the VMU and seal off the battery compartment. Insert some fresh batteries or plug the AC adapter into the wall and see if the VMU powers on. It should spring to life with a long ear-piercing beep as soon as it receives power; you shouldn't have to press the mode or sleep buttons to get it to work. If it doesn't work, here are some tips to help you identify the problem:
*With the VMU receiving power, use a voltmeter to check the voltage at the solder points to confirm that you get 6V there. If you don't, then there is problem with the connection. Check the wires the continuity.
*If you're using batteries, make sure they are new and each outputting close to 1.5V. Batteries steadily decrease their voltage output as they are drained, so even a couple partially drained batteries could keep the VMU from powering up.
*If you're using an AC adapter, double check that the AC adapter itself is functioning with a voltmeter.
*If you've previously opened the VMU, the battery terminal blades may not have been properly reconnected to the circuit board. Open the VMU and make sure the terminals are tightly screwed into the board so that a connection is being made.
When everything is confirmed to be working, use some electrical tape or hot glue to seal off the battery compartment. It won't look pretty, but that's the price for functionality.
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