JL Audio J2250.1 owner manual Power Connections, Fuse Requirements

Power Connections

Before installing the amplifier, disconnect the negative (ground) wire from the vehicle’s battery. This will prevent accidental damage to the system, the vehicle and your person during installation.

Ground Remote + ￿￿VDC

The J2-250.1’s “+12 VDC” (positive) and

“Ground” (ground) connections are designed to accept up to 4 AWG power wire. 8 AWG is a minimum power wire size for this amplifier.

If you are installing the J2-250.1 with other amplifiers and wish to use a single main power wire, use 2 AWG or 1/0 AWG main power wire (depending on the overall current demands of all the amplifiers in the system). This 2 AWG or 1/0 AWG power wire should terminate into a distribution block mounted as close to the amplifiers as possible and should connect to the J2-250.1 with 8 or 4 AWG power wire.

Note: that smaller AWG numbers mean bigger wire and vice-versa (1/0 AWG is the largest,

2 AWG is smaller, then 4 AWG, then

8 AWG, etc.).

To connect the power and ground wires to the amplifier, strip 1/2-inch (12 mm) of insulation from each wire and insert the bare wire into the the appropriate terminal block positions on the J2-250.1. Use a Phillips screwdriver to secure the wire via the screw on the top of each terminal.

The “Ground” connection should be made using 8 AWG or 4 AWG 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. The use of a star washer to lock down the connection is advisable.

Any wires run through metal barriers (such as firewalls), must be protected with a high quality insulating grommet to prevent damage to the insulation of the wire. Failure to do so may result in a dangerous short circuit.

! IMPORTANT

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 (or larger) when installing a J2-250.1.

Fuse Requirements

While the J2-250.1 has a 30A ATC fuse on its power connection panel, this fuse does nothing to protect the vehicle from a dangerous short circuit in the power wire. It only protects the amplifier. It is absolutely vital that the main power lead to the amplifier(s) in the system be fused within

18 inches (45 cm) of the positive battery post connection. The fuse value at each power wire should be high enough for all of the equipment being run from that power wire. If only the

J2-250.1 is being run from that power wire, we recommend a 30A fuse be used. AFS, ATC, AGU or MAXI-type fuses are recommended.

FUSE

30A

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