Optional Horn Relocation to Front of Radiator
I was starting on implementing my auxiliary power fuse/distribution block today and needed the location of the optional horn for components used for my auxiliary power system. I pulled up the electrical diagram and found that the horn wire is GR-B (Grey/Black). Using this information I was able to trace the wire back through the wiring harness and move the horn the what I feel is a better location, in front of the radiator with the other horn. Included here are a few picture and some instructions on how I did this modification to my FJ. (Please note that messing with your FJ electrical system should not be taken lightly, you just might toast something.) Before working on any part of your electrical system always disconnect the battery.
Figure 1 – Horn wiring diagram
Step 1: Remove the option horn from its location at the left rear side of the engine compartment.
Step 2: Remove the bracket from the horn and flatten the bends out.
Step 3: Shorten the bracket by about ¾” and drill a hole in it that will accommodate the bolt.
Figure 2 – Horn bracket
Step 4: Reattach bracket to the horn and mount it in the new location. There is a threaded stud located about 6” from the left edge of the radiator in the top bar. Mount the horn facing down in this location.
Figure 3 – Horn mounted in new location
Figure 4 – Another picture of horn in new location
Step 4: Locate the wiring harness at the left upper side of the radiator, open the loom and pull the wires out. You will need to remove an electrical tape wrap from the wires.
Figure 5 – Wiring harness
Step 5: Locate the Grey/Black wire and cut. (Be sure you cut the correct wire. I verified it with an Ohm meter.)
Figure 6 – Horn wire location to be cut
Step 6: Cut the original horn connector off next to the harness so you can reuse the connector at the new location.
Step 7: Remove the trim panel that covers the space between the radiator and the bar in front of it. To remove the clips pry out the center and the clips will pull out. Be careful I broke 2 clips that I now need to replace.
Step 8: The harness is held in place by 2 clips that can be removed from the side facing the front. Once these clips are pushed back trough you can pull the harness up between the AC condenser and the cross bar.
Step 9: Open the wire loom and locate the Grey/Black wire and pull the wire through from the left were you cut it.
Figure 7 – Horn wire being pulled out
Step 10: Reattach the horn connector in the new location. I added a plastic sheath to cover most of the wire. I tried to disassemble the connector so I could attach the wire directly with no splice but even with the lock remove I could not get it apart.
Figure 8 – Connector reattached
Step 11: Tape the point where the wire comes out of the wire loom.
Figure 9 – Taping the wire loom
Step 12: Plug the connector into the horn.
Step 13: Reattach the wire loom behind the cross bar.
Step 14: Replace the trim panel.
Step 15: Be sure the wires are stuffed back into the wire loom next to the radiator.
Step 16: Reattach Battery.
Step 17: Test your horn.