Blue Ox BX88274 User Manual
BX88274
High Current Fuse ByPass Switch
Installation Instructions
ALWAYS match the amperage of the fuse in the Fuse ByPass Switch harness to the fuse removed
from the fuse panel.
NEVER install a fuse with more than a 50 amp rating in the Fuse ByPass Switch harness.
REMOVE any fuse from the Fuse ByPass Switch harness.
BEFORE YOU BEGIN: Consult the owner’s manual for the towed vehicle
to determine which fuse must be removed from the “towed” vehicle’s
under hood fuse box. Remove the large
plastic fuse box cover and remove the high
amperage (e.g. 50 amp) fuse. Conrm that
the colored connectors on the Fuse ByPass
Switch wire (or adapter if supplied) match the pin sizes in the fuse box
location from where you removed the fuse. If your manual requires that
you remove another mini fuse, typically the 15 amp ECM fuse, you will
need an additional mini version of the Fuse ByPass Switch.
Note: A small 5/8” access hole will be drilled into the fuse box cover to complete the installation. It is
recommended that you follow the steps below prior to drilling the access hole.
1. Install the adapter, if supplied. Use a test light or multi-meter set to read 20 volts DC in order to
determine which of the two (2) pins in the fuse box has 12 volts present. Connect the mutli-meter
probe or the clip connector from the test light to a suitable ground connection. Probe the two (2)
terminals with the probe to nd the one that shows 12 volts or lights the test light when the probe
is touched to the fuse box terminals. Install the red connector on the Fuse ByPass Switch onto
the 12 volt terminal identied. It is often the one closest to the passenger compartment. Install the
remaining blue connector onto the other terminal in the fuse box.
2. Using a portable drill with a Phillips head screwdriver bit, install the ring
connector from the small black fuse holder wire using the supplied self drilling
screw. Locate this screw on the inner fender area close
to the fuse panel so that when installed there is sufcient
wire to lay the Fuse ByPass Switch in a convenient
location near the fuse panel. An alternative is to loosen
the large ground stud to the left of the fuse box and fully
insert the terminal under the ring as shown in the photo, then securely
tighten to retain the ring terminal.
3. Reinstall the 2 amp fuse into the small black fuse holder.
4. Install the larger high current (e.g. 50 amp) fuse into the larger rubber fuse
holder in the Fuse ByPass Switch harness. Gently press it into place and
insure it is fully seated. Cover it with the supplied rubber cap.
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BX88274
High Current Fuse ByPass Switch
Installation Instructions
Test the Fuse ByPass Switch by checking that when the button on the top of the Fuse ByPass Switch
is in the drive position that the car dash lights and functions operate the same as they did before.
With the car engine and key turned fully off, ip the Fuse ByPass Switch to
the tow position.
All lights and operations that are controlled by the fuse in this circuit should
be off. This mimics the fuse being removed from the fuse panel when towing.
If the Fuse ByPass Switch operates as expected, continue, if not, please
reference the Troubleshooting section.
5. Remove the Fuse ByPass Switch connectors and adapter if supplied, from the fuse box. Note
which terminal the red connector was installed in.
6. Select one of the methods below to route the wiring out of the fuse panel.
Method A
a. Measure from the end of the fuse panel to the center over the
removed fuse terminals. Write down the dimensions.
b. Measure from the side of the fuse panel to the same location over
the removed fuse terminals and write down the dimension.
c. Properly orient the fuse panel cover over the fuse panel and mark
the two dimensions on the cover of the fuse panel.
d. Drill a 5/8” hole at the intersection of these dimensions use a at power auger.
Method B
a. Alternatively drill a 5/8” hole at the top, left corner of the cover using a at power auger.
7. Feed the Fuse ByPass Switch terminals through the hole insuring
that the black loom extends from the hole.
8. Reinstall the connectors and replace the cover making sure it
locks on using the plastic tabs.
9. If a Mini Fuse ByPass Switch must be installed, it should be
located at the lower, center of the top cover. Reference the dotted lines in the images shown
above.
Note: this requires a 3/4” hole and the drive position has the white dot side of the switch
depressed when driving the vehicle and the tow position has the black (unmarked side)
depressed when towing. This is opposite of the High Current Fuse ByPass Switch. Install the
labels supplied with the white dot on the switch matched to the drive label.
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