Specifications

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UBS Wiring Harness Handbook
Assemble the clamp (provided) to the main and
rear sill connection and then pack with grease using
the fitting on the side. This is not a “required”
installation method, but it is highly recommended.
Failure to do so could limit and/or void the
warranty.
The rear sills are designed with female receptacles
so sealed connections can be made and the need to
cut and splice wires is eliminated.
Plug the lamp harness or pigtail for your rear
marker lamps and route the cable to the rear sill.
Remove the provided dummy plug and make your
connection.
TIP: It’s important to always leave dummy
plugs in female ports not being used to
power lamps. This eliminates the risk of
moisture or dirt getting into the plug.
Follow this same approach when installing the
license lamp and the rear identification cluster.
Route the cable from the lamps to the rear sill.
Excess wire can now be secured with wire ties.
TIP: Always secure wires and cables and do
not allow them to hang loose. Snow, ice and
mud can build on wires and the extra
weight can cause accidental disconnects.
Also, don’t route wires over rear tires since
debris and blowouts could cause damage
to exposed cables.
While working at the rear of the trailer, make
connections for the stop, tail and turn lamps to the
rear sill harness. Tie and secure the wires to avoid
chafing or rubbing in the light module. Attempt to
keep the wires from resting in the bottom of the
light module.
TIP: Do not secure these lamps into the
trailer until after installation test is
complete.
Finish plugging all plugs into lamps at the rear of
the trailer and work your way forward. Connect the
side turn lamps if not done already.
When at the front of the trailer you need to route
the wires and make the connection for the front
markers. It’s recommended the wires be routed on
the inside of the trailer and protected when
possible. If not possible, route the wires in a
manner that protects them from damage from
causes such as impact with tree limbs.
If there are any additional marker lamp
connections, make them now using the same
procedures. Don’t overload circuits when
connecting extra marker lamps. Review the lamp
information (amp draw) for proper power
distribution.
Inspect the trailer once more, reviewing all plug
and lamp connections. Make sure the installation
procedure used the color-coded wires for the
correct connections and that all wires and
connections are secure. You should confirm that all
connections are properly grounded and that no
circuit (black and brown especially) has been over-
loaded.
Connect a proper power supply to the nose box.
Use a source such as a yard truck or a power
supply with which you can control individual
power output to the six color locations.
TIP: Make sure you have a proper ground
connection method.
Grote offers both ground return and frame ground,
but emphasizes the use of ground return. Though a
frame ground system offers less voltage drop
initially, in time improper grounding can cause
excessive voltage drop due to corrosion. A ground
return system offers a sealed, constant system.
Grote’s main and rear sills are always ground
return, with the rear sill having a redundant frame
ground.
Turn on the power to the tail and marker functions
(black and brown) and make sure all marker lamps
and tail lamps are illuminated. This would include
license lamp and side marker.
Check your stop circuit (red) and then right (green)
and left (yellow) turns. Make sure side turn signals
are performing properly.
The UBS system provides a modular solution for
retrofit or new installation of lighting and wiring
systems for trailers. The Plug and Go design offers
un-paralleled ease of installation and superior
protection against moisture and contaminants.