Hummer H1 (2006+). Manual - part 412

13-22

Accessories

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 Trailer Towing

Figure 13-32:   Trailer Wiring Connector and Dummy Plug Location

Trailer Jumper Harness

HUMMER H1 vehicles come from the factory equipped for easy installation of the trailer jumper harness. The trailer jumper har-
ness may be installed as part of the factory trailer towing package or an add-on kit. Body wiring harnesses are designed with a
trailer wiring connector at the rear of the vehicle body above the rear bumper (Figure  13-32). Rear bumpers are manufactured with
a cut-out for the trailer harness receptacle.

Installation

1.

Insert the trailer jumper harness through the rear bumper cutout and bolt the receptacle in place  (Figure  13-33).

2.

Remove the dummy plug and plug the trailer jumper harness connector into the trailer wiring connector.

Trailer Brake Controller

Spare wires have been provided in the body harness and routed from the instrument panel/fuse box area to the trailer connector at
the rear of the vehicle. Install the trailer brake controller using the manufacturer’s instructions.

The following information about the HUMMER H1 electrical system is necessary for installation:

1.

Three shrink-wrapped wire leads can be found under the instrument panel  (Figure  13-34), they are:

Yellow—power

Red—stop light signal

Dark blue—trailer brake

FRONT OF VEHICLE

TRAILER WIRING 

REAR OF VEHICLE BODY

ABOVE REAR BUMPER

DUMMY PLUG

CONNECTOR

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 Accessories  13-23

5745804

Figure 13-33:   Trailer Jumper Harness Mounting

2.

The trailer brake circuit will not have power until a fuse (of required amperage) is installed in the fuse block position 7H—the
far upper right hand corner of the fuse block.

Figure 13-34:   Trailer Brake Controller Wiring 

TRAILER HITCH REPLACEMENT

Removal

1.

Remove the locknuts, washers, receiver assembly mounting blocks, bolts, and the washers from the body mount bracket (Fig-
ure  13-35).

2.

Remove the bolts, lockwashers, washers from the lower brace weld nuts. Remove the brace from the bumper and the trailer
hitch mounting brackets.

3.

Remove the bolts, washers, and the trailer hitch from the rear bumper weld nuts.

Installation

1.

Position the trailer hitch receiver on the rear bumper and secure with the weld nuts, bolts and the washers (Figure  13-35). Do

BODY WIRING HARNESS

TRAILER JUMPER HARNESS

RECEPTACLE

REAR BUMPER

TRAILER

WIRING

CONNECTOR

GASKET

STEERING COLUMN

RED/STOP LIGHT

YELLOW/

POWER

DARK BLUE/

TRAILER BRAKE

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Accessories

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not tighten at this time.

2.

Secure the trailer hitch to the body mount bracket with the locknuts, washers, receiver assembly mounting blocks, bolts, and
the washers.

3.

Install the lower brace to the bumper and the trailer hitch mounting bracket with the bolts, lockwashers, washers and the weld
nuts.

4.

Tighten all the locknuts to 90 lb-ft (122 N•m).

Figure 13-35:   Trailer Hitch

 SIDE STEP BARS (TUBULAR)

Figure 13-36:   Side Step Bar Installation

NOTE: This procedure covers the left side of the vehicle. The procedure for the right side is the same.

REAR BUMPER

TRAILER

HITCH

WELD NUT

RECEIVER

TRAILER HITCH

MOUNTING BRACKET

LOWER 

BOLT

LOCKWASHER

WASHER

BRACE

RECEIVER ASSEMBLY

MOUNTING BLOCK

BODY

MOUNT

BRACKET

SIDE BRACKET

9-S13-001

STEP

BAR

TUBE

BRACKET

SUPPORT

BRACKET

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 Accessories  13-25

5745804

Removal

1.

Remove the four bolts securing the tube brackets to the support brackets (See Figure 13-36).

2.

Swing the step bar and the angle bracket assembly down, disengage the  tube brackets from the support brackets and remove
the assembly.

3.

Remove the four bolts securing the step bar to the tube bracket and slide the step bar and the end cap out of the tube bracket.

4.

Remove the two support bracket mounting nuts bolts and the washers in the rear wheel well.

5.

Remove the two bolts and the washers going through the rear support bracket into the rocker panel protection floor area and
remove the support bracket.

6.

Remove the two support bracket mounting nuts bolts and washers in the front wheel well.

7.

Remove the two bolts and the washers going through the front support bracket into the rocker panel protection floor area and
remove the support bracket.

Installation

1.

Install the front and rear support brackets on the rocker panel protection with the bolts, washers and the nuts (See Figure 
13-36).

2.

Slide the tube brackets onto the bar in their respective positions (angled bracket to the rear).

3.

Place the bar end caps on the ends of the bar and install the bolts, washers and the lockwashers through the tube brackets into
the bar. Do not tighten at this time.

4.

Hang the bar assembly on the tabs of the support brackets, swing the bar up and secure the tube brackets to the support
brackets with the bolts, washers, lockwashers and the nuts.

5.

Tighten the remaining hardware now.

ROOF RACK 

Removal

WARNING:  Roof rack is extremely heavy. Several people may be required to remove and install rack safely. Use
care in determining ability to lift the rack. Failure to do so may result in injury.

1.

Remove the two mounting bolts and adjusting the nut on each “L” bracket (Figure  13-37).

2.

Remove the “L” brackets.

3.

Remove the rack from the vehicle.

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