Ground Connection - JL Audio HD750/1 Owner's Manual

ground connection

The chassis ground connection must be
made using 4 AWG or 8 AWG pure copper
wire and should be kept as short as possible,
while accessing a solid piece of sheet metal
in the vehicle. The surface of the sheet metal
should be sanded at the contact point to create
a clean, metal-to-metal connection between
the chassis and the termination of the ground
wire with a brass or copper power ring. For
optimal grounding, we recommend the
use of a JL Audio ECS master ground lug
(XB-MGLU). Alternatively, a sheet metal
screw or bolt can be used with a star washer.
Many vehicles employ small (10 AWG - 6 AWG)
wire to ground the battery to the vehicle chassis
and to connect the alternator's positive
connection to the battery. To prevent voltage
drops, these wires should be upgraded to 4
AWG pure copper wire when installing amplifier
systems with main fuse ratings above 60A.
turn-on wire
The HD750/1 uses a conventional +12V
remote turn-on wire, Remote turn-on output.
The amplifier will turn on when +12V is present
at its "Remote" input and turn off when +12V
is switched off. If a source unit does not have a
dedicated remote turn-on output, the amplifier's
turn-on lead can be connected to +12V via a
switch that derives power from an ignition-
switched circuit.
The HD750/1's "Remote" turn-on connector
is designed to accept 18 AWG – 12 AWG wire. 18
AWG is more than adequate for this purpose.
To connect the remote turn-on wire to the
amplifier, first back out the set screw on the
bottom of the Power Connector Plug, using the
supplied 2.5 mm hex wrench. Strip 1/2 inch
(12mm) of wire and insert the bare wire into the
receptacle, seating it firmly so that no bare wire
is exposed. When using smaller wire, it may
be necessary to strip 1 inch of insulation from
the wire and fold the bare wire in half prior to
insertion. While holding the wire in the terminal,
tighten the set screw firmly using the supplied
2.5 mm hex wrench, taking care not to strip the
head of the screw and making sure that the wire
is firmly gripped by the set screw.
amplifier Power connector Plug
To connect the power wires and the remote
turn-on wire to the amplifier, unplug the power
connector plug from the amplifier chassis (pull
back firmly) and back out the set screws on
the connector plug, using the supplied 4 mm
hex wrench for the "+12 VDC" and "Ground"
connections and the supplied 2.5 mm hex wrench
for the "Remote" connection. Strip 3/8 inch (10
mm) of insulation from the end of each wire and
insert the bare wire into the receptacle on power
connector plug, seating it firmly so that no bare
wire is exposed. While holding each wire in place,
tighten each set screw firmly, taking care not to
strip the head of the screw.
Never make power connections with a "live"
wire. Always disconnect the negative battery
post before making any connections or
adjustments to a 12V power connection!
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