Installation Guide

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WEATHERGUARD.COM
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Installation of fusebox wiring harness
For use with all makes and models of trucks
DETERMINE A FUSE SLOT TO USE
Identify an open fuse slot in the under-the-hood
fuse box that will provide constant power (battery
power). For easier installation, review the vehicle
owners’ manual to locate the horn fuse (or any
other always powered accessory) and utilize the
open slot in the same row as that fuse.
RECONNECT THE BATTERY
DISCONNECT BATTERY
Disconnect the negative
terminal from the truck’s
battery.
CONNECT NEW TRUCK BOX HARNESS TO TRUCK FUSE BOX AND GROUND
A. If you are utilizing a slot currently in use -
as in the case of the horn slot - remove the existing
fuse (select the fuse with 10 amp or less in rating)
and insert it into the lower fuse slot on the fuse end
of the harness. Plug in one of the 3 fuse ends
provided with your harness that fits into the fuse
slot.
B. If you are utilizing a slot currently NOT in use, plug in one of the 3
fuse ends provided with your harness that fits into the fuse slot. Please
note, if the fuse slot is not programmed to provide constant power, no
power will reach the truck box.
C. Attach the white ground wire from the harness to an existing
ground near the fuse box.
STEP 1
STEP 2
STEP 5
ROUTE HARNESS TO TRUCK
BED
Route the new harness inside the truck body
between the fuse box and the knock out hole in the
bulkhead of the truck bed. It is recommended to
follow the path of an existing vehicle wiring harness
along the frame of the truck (recommend driver
side). Secure the new harness to the truck in a few
locations using the zip ties supplied.
ROUTE HARNESS INTO TRUCK
BOX AND CONNECT
Remove the knock-out plug from the bulkhead of
the truck bed, feed the harness end into the truck
bed and then through the grommet in the side of
the truck box.
STEP 4
STEP 3
G
10A
Ground
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CHECK THE FUNCTIONALITY
With the lid open, LEDs should be lit.
Close the lid approximately ¾ of the
way and confirm LED lights turn off.