SOURCE: Third brake light flashing when engine is off, no main brake lights
this does not sound like a fuse problem. seems like a wiring issue. You probably have wires shorted together, and/or shorts to ground somewhere.
Brake switch is a good place to start, make sure it's working fine. To find the wiring issue you will need electrical diagrams, so get yourself a repair manual for a 1998 Explorer.
Look at connectors, see if you can find components or connections where all the brake light and tail lights connect to together. Using a multi meter you should be able to pin point the issue if u follow the wiring from the battery to the lights using the diagrams and checking connectors.
SOURCE: 2004 chevy 1500 brake lights not working
check fuse under hood, batery terminals coroded wire at harness if everything fails run a hot wire to rear brake line with an interuptor.
check the swich under the foot brake.
vitally
SOURCE: how to replace third brake light on 1997 lexus es 300
"To get access to the 3rd brake light:
- Place each hand against both sides of the plastic housing, and firmly
grasp and pull the housing towards you. It might not budge at first,
but it should move once you get a good grip on it.
- Pull the housing out just enough so that you can see the brake light
bulb and stick your hand underneath. Ignore the speaker wires.
- Pull out the old bulb from the socket (it plugs in/out). Wear rubber
gloves when handling the new bulb, and put the new one into the socket.
- Reverse the steps here to put the 3rd brake light back into place. Test out your brake light, and you're done" quoted from lexusk8 @ clublexus.com (great forum)
SOURCE: replacing brake light above trunk on 2006 chrysler
This is quite a process....
Removal
1) Disconnect and isolate the negative battery cable.
2) Remove the rear shelf trim panel.
3) Disconnect the CHMSL electrical connector (1).
4) Remove the two mounting fasteners (3) to the CHMSL (2).
Installation is opposite of removal.
Rear shelf trim panel
Removal
1) Disconnect and isolate the battery negative cable.
2) Remover the right and left lower and upper C-pillar trim.
3) Remove the nut that secures the center rear seat belt lower anchor to the stud on the floor panel and feed the seat belt webbing back through the opening in the top of the rear shelf panel trim (2) to the retractor.
4) Remove the push-pin fastener (1) that secures the trim (2) to the rear shelf panel.
5) Slide the trim forward to disengage the S-clip that secures the underside of the trim to the to the center of the shelf panel.
6) Remove the trim from the rear shelf panel.
Installation
1) Position the trim (2) onto the rear shelf panel(3).
2) Slide the rear edge of the trim rearward to engage the lens bezel of the center high-mounted stop lamp and far enough to engage the S-clip that secures the underside of the trim to the center of the shelf panel.
3) Install the push-pin fastener (1) that secures the trim to the rear shelf panel.
4) Pull the center rear seat belt lower anchor and belt webbing from the retractor through the opening the the top of the rear shelf panel trim and back down to the stud on the floor panel.
5) Install and tighten the nut that secures the seat belt lower anchor to the stud on the floor panel. Tighten the nut to 34 N m (25 ft. lbs.).
6) Reinstall the right and left upper and lower C-pillar trim.
7) Connect the battery negative cable.
C-pillar trim removal
Seat removal
Hope this all gets it done for you........
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