Based on my previous experience with the Alpine Mobile Multimedia
Station, 1 wire needs to see 12 volts ie. brake light wire, the other
needs to see ground ie. parking brake.
You can hook up the wire that needs 12 volts to either ignition or some
other 12 volt source. The other wire needs to be connected to a toggle
switch to ground. Then flip the switch as needed to simulate the
parking brake and voila...
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