Pioneer GM-A5702 Owner's Manual page 11

Connecting the units
2 Twist the battery wire, ground wire
and system remote control wire.
3 Attach lugs to wire ends.
Use pliers, etc., to crimp lugs to wires.
1 Lug (sold separately)
2 Battery wire
3 Ground wire
4 Connect the wires to the terminal.
Fix the wires securely with the terminal
screws.
1 System remote control terminal
2 Ground terminal
3 Power terminal
4 Terminal screws
5 Battery wire
Twist
En
6 Ground wire
7 System remote control wire