Electrical Brake Light Switch

Shane8996GTLX

Active User

Oct 22, 2017

61

4

18

Illinois

Oct 26, 2017

#21

• Oct 26, 2017

• #21

Thanks. What did you pay for yours.

 

wmburns

SN Certified Technician

Aug 14, 2009

5,892

514

204

Houston Texas

Oct 27, 2017

#22

• Oct 27, 2017

• #22

What I'm not seeing is the results of the test CONFIRMING there is +12 volts on BOTH sides of the brake on/off switch (BOO) with the brake pedal depressed. Use a KNOWN good ground.

What to do next depends upon this test result. Anything else is just guessing.

If interested in getting a copy of the Ford service manual with wiring diagrams I maybe able to help. PM if interested.

 

Last edited: Oct 27, 2017

Shane8996GTLX

Active User

Oct 22, 2017

61

4

18

Illinois

Oct 27, 2017

#23

• Oct 27, 2017

• #23

Only 12 volts noted to red/ green wire. Can't source any to Green/red.

 

wmburns

SN Certified Technician

Aug 14, 2009

5,892

514

204

Houston Texas

Oct 28, 2017

#24

• Oct 28, 2017

• #24

Shane8996GTLX said:

Only 12 volts noted to red/ green wire. Can't source any to Green/red.

Click to expand...

Confirm this test was done with the brake pedal depressed.

If the test results are correct, the only reasonable possibility is a problem with the brake on/off switch.

Want further proof of the diagnosis? Short/jump the RD/GN and GR/RD wires together. This should cause the brake lights to come on.

Now as to what the root problem is. This could be:

• Bad brake on/off switch
• incorrectly adjusted or installed brake on/off switch. For example the switch is not activating when the pedal is depressed.
• Wiring fault such that power isn't really passing through the switch.

 

Last edited: Oct 29, 2017

Shane8996GTLX

Active User

Oct 22, 2017

61

4

18

Illinois

Oct 28, 2017

#25

• Oct 28, 2017

• #25

I will try the short idea. Maybe shim the switch? Pedal was in normal state and pressed with the same result.

 

Shane8996GTLX

Active User

Oct 22, 2017

61

4

18

Illinois

Nov 4, 2017

#26

• Nov 4, 2017

• #26

karthief said:

Do you have power at one of those wires?
What year/model are we talking about

Click to expand...

There is power to one of the wires. It's. 96 GT

 

General karthief

wonder how much it would cost to ship you a pair

5 Year Member

Aug 25, 2016

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polk county florida

Nov 4, 2017

#27

• Nov 4, 2017

• #27

Power in to switch, no power coming out with switch activated, I'd say its the switch, someone mentioned touching the wires together see if lights worked, try that?

 

Shane8996GTLX

Active User

Oct 22, 2017

61

4

18

Illinois

Nov 4, 2017

#28

• Nov 4, 2017

• #28

Can I text you it would make it easier ? I tried the old and new switch as well as touching the wires. No luck.

 

General karthief

wonder how much it would cost to ship you a pair

5 Year Member

Aug 25, 2016

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Nov 4, 2017

#29

• Nov 4, 2017

• #29

Then your problem is between there and the back, you need a wire diagram, have you checked the wires in the trunk?
Do you have a volt olm meter

 

Shane8996GTLX

Active User

Oct 22, 2017

61

4

18

Illinois

Nov 4, 2017

#30

• Nov 4, 2017

• #30

I don't know what wires to check and have no wire diagram

 

Shane8996GTLX

Active User

Oct 22, 2017

61

4

18

Illinois

Nov 4, 2017

#31

• Nov 4, 2017

• #31

Yes I have a voltmeter

 

General karthief

wonder how much it would cost to ship you a pair

5 Year Member

Aug 25, 2016

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polk county florida

Nov 4, 2017

#32

• Nov 4, 2017

• #32

Did you say you pulled on a wire and thats when the problem started?
What color was it
http://www.veryuseful.com/mustang/tech/engine/images/Mustang-94-95-Exterior-Lighting.gif

 

Shane8996GTLX

Active User

Oct 22, 2017

61

4

18

Illinois

Nov 4, 2017

#33

• Nov 4, 2017

• #33

It was a small black wire but I have no idea where it would of gone.

 

General karthief

wonder how much it would cost to ship you a pair

5 Year Member

Aug 25, 2016

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polk county florida

Nov 4, 2017

#34

• Nov 4, 2017

• #34

The black wire your talking about, was it in the boo switch area

 

Shane8996GTLX

Active User

Oct 22, 2017

61

4

18

Illinois

Nov 4, 2017

#35

• Nov 4, 2017

• #35

Yes on the pigtail.

 

General karthief

wonder how much it would cost to ship you a pair

5 Year Member

Aug 25, 2016

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polk county florida

Nov 4, 2017

#36

• Nov 4, 2017

• #36

Is the 'pig tail' you talk about the plug for the switch?
Does your turn signals work?

 

Shane8996GTLX

Active User

Oct 22, 2017

61

4

18

Illinois

Nov 4, 2017

#37

• Nov 4, 2017

• #37

Yes for the switch. TS work

 

General karthief

wonder how much it would cost to ship you a pair

5 Year Member

Aug 25, 2016

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polk county florida

Nov 4, 2017

#38

• Nov 4, 2017

• #38

Does the switch have three spades or two

 

Shane8996GTLX

Active User

Oct 22, 2017

61

4

18

Illinois

Nov 4, 2017

#39

• Nov 4, 2017

• #39

By spades you mean connection there's 2.

 

General karthief

wonder how much it would cost to ship you a pair

5 Year Member

Aug 25, 2016

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polk county florida

Nov 4, 2017

#40

• Nov 4, 2017

• #40

Yea, found a pic.
And you have two wires in the connector red and lt green