Step 17: Wire the power

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Solder the red wire from the 9V battery connector to one terminal of the SPST switch. Solder a 5" red wire to the other terminal of the SPST switch.

Unscrew the cover from the M-type plug and slide the cover onto the end of the remaining red and black wires.

Solder the black wire to the outer ground connection on the plug. Solder the red wire to the inner power connection.

Screw the cover back on.
 
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