For Early Built 1991 Vehicles

1. Turn the ignition key to the OFF position and disconnect the negative battery cable.

2. Disconnect the 10-way connector located under the rear package shelf on the right side. If the vehicle is equipped with a lamp outage module, disconnect the outboard 10-way connector.

3. Disconnect the 8-way connector to the deck lid harness under the right side of the package shelf.


4. Disconnect the black 2-way connector just to the left of the truck lamp near the center of the package shelf.

5. Connect the jumper harness (PN 5252483) 8-way connector to the vehicle harness.

6. Connect the trailer tow harness to the 10-way, 2-way, and 1-way connectors.

Figure 1:

7. Drill a 1/8" hole in the package shelf near the trunk lamp, being careful not to pierce the interior trim. Attach ground wire to the shelf with the screw provided.

8. Secure the trailer tow harness to the package shelf harness with tie straps and route the harness along the right side of the trunk as shown in Figure 1. Secure the harness as shown with tie straps.

Figure 2:

9. Remove the carpet and cover for the spare tire compartment.

10. Using a 3/4" hole saw or frame punch, make a hole in the vertical wall of the spare tire compartment as shown in Figure 2. Coat the bare edge of the hole with a zinc based or epoxy chromate primer.


11. Push the unterminated end of the harness through the hole and seat the grommet. Route the harness under the vehicle, in a manner that will make it the least susceptible to damage, to the point where the trailer hook up will be made.

NOTE: IF THERE IS A REQUIREMENT FOR BACKUP LIGHTS ON THE TRAILER BEING USED, THE HARNESS HAS A PROVISION FOR THE LIGHTS. THE BROWN WIRE WITH THE GREEN TRACER IN THE TRAILER TOW HARNESS IS LEFT OPEN AT BOTH ENDS. THIS WIRE MUST BE CONNECTED TO THE BROWN WIRE WITH A GREEN TRACER (BACKUP LIGHT FEED) LOCATED IN THE VEHICLE HARNESS GRAY 10- WAY CONNECTOR AT THE REAR SEAT BACK SUPPORT. FUSE # 3 MUST ALSO BE CHANGED FROM A 5 AMPERE TO A 10 AMPERE FUSE TO ALLOW FOR THE ADDITIONAL LOAD OF THE TRAILER BACKUP LIGHTS.

12. Trailer wiring:

- Determine the type of connector to be used.

- Determine the function of each trailer wire.

- Be sure the vehicle and trailer wire functions are the same before the connections are made. The connections made to the unterminated end of the harness should be soldered and insulated with heat shrink tube.

13. Connect the negative battery cable and perform a functional check of trailer lights.

14. Install the spare tire cover and carpet.