Left brake light not working.

[MichaelC]

I have a 1991 Bronco XLT. The left side brake light is not working. All the other lights work including the right side brake light. It is not the bulb I have already checked it. If anyone has any ideas of what to do that would be great.

 

[Bully Bob]

Hi Mike..., welcome..!

"It is not the bulb I have already checked it"

What exactly does this mean..?  Visually, or by using voltage or a voltmeter i.e. continuity..?

Check the socket..?

The two contacts can be probed for voltage. Ground would be the walls of socket.

Does the bulb flash with turn signal on.?

 

[MichaelC]

I forgot to mention in the original post but I used a voltmeter and discovered that there is no power coming through the wire that activates the brake light but I am getting power for the turn signal and the driving light.

 

[Bully Bob]

Then my best guess would be the brake light switch at the brake pedal.

 

[MichaelC]

That was my first thought too but wouldn't that cause both brake lights to not work?

 

[Bully Bob]

I'm not sure.., it's likey they are seperate & are connected to the flasher under the dash as well.

 

[miesk5]

yo Michael,

WELCOME!

Chassis wiring-1987-91 F-Series and Bronco by Chilton
http://content.chiltonsonline.com/content/images/8828/images/88286w24.pdf
Verify that Lt GRN is brake light ckt on your pass side and then test @ Brake On/On Switch (Lt GRN) for voltage; if it has Voltage, then test at Multi-Function Switch.
Inspect Socket
Could be in turn switch or where wiring often chaffs on drivers side 1/4 panel sharp metal edge to tail light assembly
 
Turn Signal Switch Replacement & Repair Info w/Tilt Wheel in a 90; similar to 80-91

• Unscrew/remove the turn signal/tilt lever, pull the steering wheel (you may need a steering wheel puller) and remove the turn signal switch screws.

• The turn signal switch harness is a very tight fit through the steering column to the connector under the dash, especially with the harness connector attached.

• First, look closely at the new signal harness connector at the end of the new harness and write down the wire color locations. Ensure that the new connector is the same as the old one.

• Locate the base of the signal harness connector under the dash by pulling on the top from the signal switch. Be sure that you locate the correct wires!!!
  

• Then I just cut the wires on the old signal cam harness before the old connector and pulled it out from the top of the column.

• Un-pin the wires from the new connector and tape/feed the wires back down through the column.

• Re-pin the new connector, referencing the old one, and reconnect to the main harness.

• Re-install the turn signal switch, steering wheel and turn signal lever and your done.

I highly recommend a new Ford Turn Signal Switch & Harness for longevity and especially "feel". (Aftermarket Turn Signal Switches break easily and feel "funny").


Source: by Seattle FSB (SeattleFSB

 

[MichaelC]

Where is the multi-function switch located

 

[MichaelC]

I think my mechanic rigged the lights up his own way because there are some extra wires running to the lights and an extra fuse so I am just going to take it to him. Thanks for all the suggestions though.

 

[miesk5]

yo M,

Sorry; that is Ford's name for turn signal switch

on clumn

looks like this

1984 - 1991 Ford Bronco Turn Signal Switch for Models with Tilt Steering & Automatic Transmission http://www.am-autoparts.com/Ford/BroncoFullSize/turn-signal-lever/AM-16337323/273334.html?utm_campaign=gb_csv_nobr&utm_content=ZTS&gclid=CL71wILKhbsCFahj7AodpkcA5A=-===========

1985 - 1991 Ford Bronco Turn Signal Switch (Except Tilt Steering Column)

http://www.1aauto.com/1A/turn-signal-lever/Ford/BroncoFullSize/1AZTS00500/272950-1991?utm_campaign=gb_csv_br&utm_content=ZTS&gclid=CLPVxqLKhbsCFWJo7AodxHgAXQ

 

[miesk5]

 

[nelbur]

I highly recommend a new Ford Turn Signal Switch & Harness for longevity and especially "feel". (Aftermarket Turn Signal Switches break easily and feel "funny").

You are spot on with the "feel funny" comment.   I just replaced mine with a BWD brand switch and it feels strange but works well.   It was way more difficult to install than I expected on my 86 tilt column, as I had to disassemble the plug and reassemble it as it would not fit through the column wire chase.