Brake lights not working??

Discussion in '1994 - 1995 Specific Tech' started by epurdy2005, Apr 27, 2008.

  1. Found a second problem with my new stang...The brake lights don't work!..its a 1995 5.0 5 speed......Everything else works,turn signals,parking lights, but the bulb that does the brakes light doesn't work. I haven't done any testing yet accept checked the bulbs...Is there any common problem with these? I've looked at all the fuses and they all seem good.
  2. Moved to 94-95 Tech.
  3. Check the BOO. Since the TS's work, we can assume the fuse is good (it controls the BOO and TS's as I recall).

    Does the 3rd brake light work? If it does, the BOO (and fuse) are ok. Power for the outer brake lights run through the MF switch, whereas power for the 3rd brake light does not. That's why knowing if the 3rd one works is important.

    If you have no brake lights at all, check in/out voltage at the BOO (be sure the switch is closed when you test output voltage).

    Good luck.
  4. Okay, what's a BOO and where is it located? If the OP knows I don't. TS I assume is the "Turn Signal" based on the context.

  5. Sorry guys.

    BOO = Brake On/Off switch. It's standard nomenclature for our brake light switches (because it's monitored by the EEC, it's no longer simply called a brake switch).

    The switch is obviously on the brake pedal assembly.

    You got it with TS (my made up shorthand).

    MF = Multi-function switch, which is the turn signal switch. Because our tails and brakes share bulbs, the brake light wiring for the body brake lights [not the 3rd one] go through the MF switch.
  6. Thanks for clarification of the boo.......On my brake pedal there is the switch that comes out when the brake is pushed which looks okay and then theres something else on there with electrical wires going to it closer to the floor on the brake pedal. What is it? It had some electrical tape on it so maybe somebody has messed with it....I also found a purple neon while I was down tehre which I took out. And no the third brake light isn't working either...Thanks!
  7. I would assume maybe the wires went to some TRICK ASS neon racing pedals the previous owner may have had to accent his homo purple neons. Where does the other end of that wire run.

    Try replacing that brake on/off switch first. If the third brake light functions, your Multifunction should be functioning correctly.
  8. Again, check in/out voltages at the BOO.
  9. to check BOO

    #1.using test light,touch terminal at BLUE arrow with pedal in normal position.if test lights illuminate.switch is receivlng power.if no power here,check wiring to the BOO switch,also check fuse #9 under dash,should be 15 amp fuse. brake pedal down,touch test light to RED arrow.if light illuminates,switch is working.

    #3.if switch works,problem is most likely in the wiring.your going to need a wiring diagram,but im sorry i dont have one.

    If switch needs to be replaced.

    #1.disconnect wiring,BLUE arrow

    #2.pull out brown pin,RED arrow.

    #3.slide out in direction of PURPLE arrow.make note of the position of the plastic washer and bushing.

    #4.install is reverse of removal.
  10. I had a similar issue, I kept blowing the brake light fuse when I pressed the clutch pedal. It turned out that my Steeda aluminum quadtrant wore a small hole in the brake wire. It wouldn't blow the fuse if it was just quickly pushed in for shifting, just when held to the floor grounded it out long enough to blow. What a troubleshooting nightmare that was.
  11. I'm curious. How did all that rust get there when you live in Fresno?

    My car spent the first 8 years on the West Coast and it's totally rust free on the underdash metal pieces.
  12. the clutch pedal assembly is from a wrecked 94 GT i bought for the aode to T5 was sitting in the mountains in for almost 2 years in a very moist,grassy field before i bought it
  13. Having this issue as well. Power to the BOO comes and goes, but I press the brake and the power goes away, where can I check to find this issue. Thanks guys