Planning Your Power Connections - zapco ST-2B Owner's Manual

The power end plates of the Zapco ST-B amplifiers carry the power connections
and the speaker connections and vary somewhat by the number of channels.
For example, the power end of the ST-4B below has (of course) speaker
connections for four channels. The ST-B amps all have on-board fuses and the
fuse rating as printed above the fuses. The main 12-volt power input, the
12-volt turn-on wire, and the main Ground connection are common to both
models.
• The main power input must be connected the vehicle battery's positive
(+) terminal, and a main system fuse should be placed close to the battery
• The main ground or negative connection must be securely attached to
bare metal at the vehicle frame, or other heavy chassis component with
a direct connection to the frame
Note: Seat bolts and seat belt bolts are NOT good ground points
• The terminal between the main power and ground is the +12 turn-on
input and can be connected to the head unit turn-on output wire.
If none is available it can be connected to an accessory (ACC) terminal.
You should avoid using any ignition-on (IGN) wire, as they can be noisy

Planning your power connections

+12 volt at Battery positive terminal
Turn-on trigger wire
Ground to chassis
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