Brake lights and cruise control don't function - Mustang Evolution

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Old 08-03-2014, 04:10 PM   #1
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Brake lights and cruise control don't function

Ok. I know there is a circuit relationship here. I can't find a blown fuse and all 6 tail lights work (driving lights that is), but I have no brake lights and no cruise control.

I figure I'm missing something simple, but need a little help.

Thanks!


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Old 08-03-2014, 04:49 PM   #2
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Check the switch that's attached behind your brake pedal. I believe that controls your brake lights as well as shuts off cruise control when you press on the brake.

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Old 08-03-2014, 04:54 PM   #3
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The fuse that is associated with both the brake lights AND the cruise control is In position #33 in the passenger compartment fuse panel. It is a 15 amp fuse.
There is another fuse for just the brake lamps in position #41. 15 amp as well.
I've had fuses that looked intact but didn't work so you may just want to replace them.
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Old 08-03-2014, 05:16 PM   #4
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Brake lights and cruise control don't function

Both fuses, #33 and 41 look good. Maybe I should get a couple of those and replace the old ones.

I am wondering about the brake switch. How often would that malfunction?



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Old 08-03-2014, 05:19 PM   #5
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Quote:
Originally Posted by escottcarp View Post
Both fuses, #33 and 41 look good. Maybe I should get a couple of those and replace the old ones.

I am wondering about the brake switch. How often would that malfunction?



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Murphy is to blame


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Old 08-03-2014, 05:20 PM   #6
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It happens not often but I've had it happen to my 1994 formula.


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Old 08-03-2014, 05:31 PM   #7
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It could very well be the switch. It's just good to rule out the simple stuff first.
If you have a probe type electrical tester it will be easy to check the switch (and fuses) to make sure that it's functional.
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Old 08-03-2014, 07:22 PM   #8
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Just went through this one. In my car the wires to the brake switch were routed poorly and frayed from constant rubbing against the brake pedal lever.

I repaired it and all is well.
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Old 08-03-2014, 07:56 PM   #9
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Thanks vert03. I'll check it out in the daylight.


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Old 08-04-2014, 01:59 PM   #10
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Which wires were frayed? Thanks

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Old 08-05-2014, 12:30 PM   #11
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The ones plugging into the connector on the brake switch. The orange and white striped one actually broke off from the spade connector and the other one was frayed up the wire a bit right before it goes into the electrical tape on the left.
It was hitting the metal right next to it.
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Old 08-08-2014, 10:49 PM   #12
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The burned wire going into the brake switch connector should be light green with a red stripe. Mustangs have a common problem with this wire getting very hot. The heat often melts the insulation.

I'm trying to determine how far back to go to replace the wire.

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Old 08-09-2014, 08:30 AM   #13
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Ok. Turns out to be an easy fix. There was a blown 10A fuse in the #33 slot that should have a 15A fuse.

It is tough to get into a position to see under the driver side dash. So, I saw the 15A fuse that was in slot #32 and, well, you get it.

I still have a little problem that the two inside brake lights are not lighting, but one of those bulbs is probably blown. I believe those lights run in series and if one blows the other doesn't work. From a visual inspection, both bulbs looked good.

Overall, an easy fix. I figure this blown fuse has occurred in the past and the PO only had a 10A fuse on hand.

Good way to start a Saturday. I'll wrap that burned wire with extra tape when I put everything back together.


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Old 08-09-2014, 09:31 AM   #14
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Always nice when it turns out to be an easy fix! My wires were not burned, at least not until the one broken off the spade connector on the plug fell off and hit something creating a very nice spark. The other wire had the insulation worn off about 1/2 way up to where it enters the harness due to it rubbing on the brake pedal lever.

Make sure to use a lot of tape and rout the wires so they don't rub against any metal or can get hooked by your foot.

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Old 08-09-2014, 09:43 AM   #15
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Good advice vert03. My burned wire is only scorched to the wrap area where the two brake wires are wrapped together. I'll wrap it good.

I'm still having a problem with the two inside brake lights. I have verified the bulbs are good by switching them with other lit brake bulbs. I'll get to this later today.


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