User Manual

-5-
Electrical Connections
All standard lightbar models are designed for 12VDC negative ground vehicles
only. Reverse polarity will cause serious damage to the lightbar and/or vehicle.
Contact the automotive dealer if there are any doubts about the polarity of your vehicle.
RF INTERFERENCE
Please take the following steps to help eliminate any Radio Frequency Interference (RFI)
with your two-way radio.
DO NOT run the power wire for the lightbar along same path as any antenna wires.
DO NOT run the power wire for the lightbar along same path as any radio power wires.
DO NOT tap power for the lightbar off of the radio power wires.
DO NOT mount the lightbar within 20” of any antennae. Sometimes mounting the
lightbar or antenna over by just one foot can make a large difference in the interference.
Ensure the black wire from the lightbar has a good connection to the negative side of
the battery.
For all standard Razor lightbars, 15 feet of 16-conductor cable (plus a drain wire and a
foil shield) is supplied with the bar. All wires are color coded and sized at the correct
gauge. If this length is not sufficient, it is recommended that the wire harness be
completely replaced with the only connections to be made directly at the terminal block
inside the lightbar. This will reduce the number of wire connections and help prevent any
weathering problems on these connections. Refer to the Direct Wiring Guide on pages 2-
3 for further instructions on this.
CAUTION: All wires and switches should be rated for at least 125% of their
maximum current load. In addition, all wires connected to the positive terminal of the
battery should be fused at the battery for 125% of their rated load. The load can be
calculated by adding all lamp wattages and dividing by 13. (Load <Amps> = Total
Watts / 13 volts) Do not use 1/4" diameter glass fuses, as they are not suitable for
continuous duty above 20 amps. A table of recommended wire colors and wire sizes is
provided on page 1. If you are unsure of the current draw, please contact our Customer
Service Department.
TESTING THE LIGHTBAR BEFORE IT IS PROPERLY FUSED & INSTALLED WILL
VOID THE WARRANTY!!
The black ground wire should be connected to the negative terminal of your vehicle’s
battery. This wire should be at least #10 AWG wire and be as short as possible in order
to minimize the voltage loss in this wire and reduce any chance of overheating.
Since many of the lightbars we build have custom components, occasionally wire colors
may slightly vary. If you are unsure of the function of a particular wire, you may test the
function by grounding the black wire and applying +12VDC to the wire in question. Be
sure to use a 20-amp fuse when testing.