Pioneer GM-2200 Owner's Manual page 6

Connecting the battery lead (red) (GIM-2200)
Route' the' battery:lead (red) from the engine compartment to the
'passenger compartment to connect it to the amplifier. To prevent a
ircuit, do not connect the positive (+) lead not the maloly. until
the other leads have been connected. :
Passenger compartment | Engine compartment Fuse
Battery lead (red)
insert the grommet
Drill an 8-mm- into the hole. Connect the leads,
diameter hole finishing with the
in the car positive (+) lead,
which goes directly
-to the positive (+)
battery terminal.
Connecting the leads (supplied)
Connecting the speaker leads