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118479-037

Rev. A

09/09/08

ENGLISH

TOOLS NEEDED:

Drill (3/32” Drill Bit), Philips Head Screwdriver

1.

Open trunk and remove threshold panel.
Partially remove the felt trunk liner behind 
the taillights

d

.

2.

Start by locating and removing the plastic wing
nuts on both sides in the trunk behind the tail-
lights (2 per side) and set aside. Then pull the
taillight housing directly rearward to remove. 

3.

On the driver’s side, disconnect the vehicle
wiring harness from the taillight socket

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Plug the T-Connector end with the 

yellow

wire

in-between the mating plugs on the driver’s 
side taillight socket and vehicle wiring harness.

4.

On the driver’s side, route the T-Connector end
with the 

green

wire and the wire with the 4-Flat

connector down through the opening between
the vehicle bumper and body.

5.

Route the T-Connector end with 

green

wire 

to the passenger’s side and route the 4-Flat
underneath the bumper. 

WARNING

Route the wire being careful to avoid any hot
pipes, heat shields, the fuel tank or any other
points that may pinch or break the wire. 

6.

Route T-Connector end with 

green

wire up

through the opening on the passenger side,
being careful to avoid areas that could damage
wiring. Repeat step 2 for T-Connector end with
the 

green

wire.

7.

Locate a suitable grounding point near the 
connector such as the vehicle’s frame or cross
member. (Do not drill into vehicle floor or bed.)
Clean dirt and rustproofing from area. Drill a
3/32” hole and secure 

white 

wire using eyelet

and screw provided.

CAUTION

Verify what is behind any surface prior to
drilling to avoid damage to the vehicle and/
or personal injury. Do not drill into any 
exposed surfaces.

WARNING

All connections must be complete for the 
T-Connector to function properly. Test and 
verify installation with a test light or trailer 
once installed. 

8.

Reinstall the taillight housing assemblies, 
positioning the vehicle wiring harness between
the housing and the vehicle body. Secure the
remainder of the T-connector harness with 
the cable ties provided, to prevent damage 
or rattling and being careful to avoid any areas
that would cut or pinch the wire.

NOTE

Mount 4-Flat in a suitable location under 
the vehicle. Bracket not included.

WARNING

Overloading circuit can cause fires. DO NOT
exceed lower of towing manufacturer rating or:
• Max. stop/turn light: (7.5 amps)
• Max. tail lights: (7.5 amps)
Read vehicle’s owners manual & instruction
sheet for additional information.

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Installation Instructions

Directives de Montage

Instrucciones de Instalación

T-Connector

Connecteur en T

Conector en T

READ THIS FIRST:

Read and follow all vehicle warnings and installation 
instructions before beginning installation. Wear safety 
glasses and use all safety precautions during installation.

LISEZ CECI EN PREMIER:

Lire et observer toutes les consignes de sécurité et 
les instructions avant de commencer l’installation. 
Durant l’installation, veiller à toujours porter des lunettes 
de protection et respecter les mesures de sécurité.

LEA ESTO PRIMERO:

Lea y siga todas las advertencias e instrucciones de 
instalación del vehículo antes de empezar la instalación. 
Use gafas de seguridad y todas las precauciones de 
seguridad durante la instalación.

Buick LaCrosse

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