no brake lights

[mclark]

Happy holidays to all, 1994 auto Sho, no high mount or brake lights, have replaced brake light switch twice, what to look for or check from this point,

 

[zoomlater]

you replaced the BOO switch correct? any fuses burned out?

 

[luigisho]

BOO switch and fuses are the 1st place to look. After that-- looks like probably wiring schematics and probing. You have an EVTM (electrical vacuum troubleshooting manual)? I had one for every SHO I have owned over the years. I'd look for year model specific one on ebay like this one

1994 Ford Taurus Mercury Sable Electrical Troubleshooting Manual GL LX SHO GS LS | eBay

"1994 Taurus/Sable Electrical & Vacuum Troubleshooting Manual" Written for Ford dealership mechanics, this book will help you troubleshoot or diagnose electrical and vacuum problems. You will find electrical and vacuum diagrams broken down so that you can perform specific tests. Look for...

www.ebay.com

 

[zoomlater]

read through this post about the cruise control

93 SHO no brake lights

Hi I have a 93 SHO and the brake lights don't work. The cruise control doesn't work either. Also it won't shift out of park. I replaced the switch on the brake pedal but still nothing. Does anyone know what it could be?? please help..

shoforum.com

 

[SHOrod]

Did you confirm you have power to the BOO switch when down there to replace it? Checking the fuse (Fuse #1, 15A) would be an easy first check, but if you have power to and through that fuse, confirm you have power to and through the BOO switch. Report back if further diagnosis is needed.

-Rod

 

[SHO@Sparks]

As Rod stated the fuse feeding the brake light switch is position #1 and a 15 amp. It comes out of the fuse box on a LG/R wire to the brake light switch at connector C2016. Confirm the you have 12.0 + V at the switch on that wire. Then with the brake switch applied you should have 12.0 + V on the other wire a R/LG wire.

If you suspect another switch failure, you can easily disconnect the brake light switch connector and jumper the 2 pins. If the brake lights now work, then either the switch is bad, the electrical connector C2016 for the switch has bad contacts or a fatigued wire at the switch. It wasn't uncommon to have the wires just out of the switch get fatigued from flexing the wiring when the pedal was applied. Motorcraft and other after suppliers make the electrical connector with new pigtail wires, so you can solder in a new connector with additional wiring.

 

[mclark]

Checked all fuses, no blown fuses, will start trouble shooting tomorrow break in the weather,