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No , the turn / hazard flasher has nothing to do with the brake lights . The brake lamp switch on top of the brake pedal arm , fuse # 11 20 amp located in the under hood fuse box an wiring an the bulbs . are all that control the brake lights .Do know what a wiring diagram is ? How to use a DMM - digital multi - meter to test electrical circuits ? Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. year , make , model an engine size. Under system click on lighting ,then under subsystem click on exterior lighting . Click the search button , then click the second blue link , the first diagram is for the brake lights electrical circuit . Watch these videos on automotive electrical testing . Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts Electric Testing Techniques You Need to Know
The brake switch at the pedal does have six wires, but none go to the multifunction switch (on the steering column). The white wire with tan tracer goes to the combination flasher to be integrated with the turn signals/hazard lights. The combination flasher is under the dash next to the steering column and has a sixteen pin connector (ten of which have wires).
Beyond the always FIRST STEP of blaming the "FLASHER"....
(see rockauto example $ below)
There immediately follows moving on out to the light bulbs and checking they (EACH & EVERY) work...
Then & only then do you start "BACK-TRACING"
I always recommend getting REAL FACTORY support documents but luckily BBB Industries has FREE documents for popular USA models: and TECHNICAL SERVICE BULLETINS...
(foreign & domestic... (registration required... real documents))
Go to the wiring SCHEMATIC... You will find REFERENCES to both BATTERY & GROUND...
It would be really helpful to know... WORKING STATUS?
Tail lights
Brake lights
Left signal
Right signal...
If Tail lights and Brake lights work... you can
pretty much forget about BACK-TRACING altogether...
Start with your FLASHER power source and move
immediately into the "multi-contact flasher switch
also check under hood , best place for wiring is=type in
(images of wiring diagrams 1994 Silverado 1500 (and what you need ) )like brake switch, fuses, relays, do you have a trailer plug on the back see if it's has broken or shorted wires, green cheese in plug .
Get a wiring diagram from the Free portion of the Autozone site. It is a little work to separate the Help categories at the bottom of their Webpage.
I have heard of SOME 4-way flashers that are built into the turn stalks causing problems. The contact pins for the turn signals are shared as 4-way flasher pins. Try clicking the 4-way flashers off/on about 20 times and then use the left turn signal. It has been known to reseat the contact pins.
The wiring diagram I mentioned would show where the tailgate top light gets its power. One feed should go to the brake light switch for the brakes and another feed should be the flasher feed.
As I see it, you have 2 extra lights going on when you use the left turn signal. Those 2 lights are the tailgate light and right turn signal. The wiring diagram should show the places where the wires are close enough to cross. I am thinking the 4-way flasher is the only place where the top tailgate light gets flasher power; the rest of the time the tailgate light is a Brake light.
I do not want to spend your money on an unnecessary turnstalk and that is why I say to look at a wiring diagram and see if there is anyplace where the wires could cross.
Last, trailer hitch plug. All wires are bundled with left turn, right turn, and brake light in the trailer hitch plug. Corrosion could connect the terminals.
work on one thing at a time, brake lights first, check the brake switch, is it mounted ok ? is power geting to it ? replace if any doubt. check all fuses, replace 4-way flasher, cheap fix . a repair manual has good info, including wire diagrams, for all circuits, etc.,,.. check wir harness @ rear of truck, & along frame for damage, corrosion, etc.,.
Chances are the brake switch has failed. The switch is located at the brake pedal in the front or behind the pedal arm. You will have to be on your back looking in order to see it. There will be a two wire switch. When the brake pedal is depressed the contacts on the switch open (or close depending on how the switch is placed) that in turn illuminates the brake lights. Easy to check with a 12 volt test light. One of the wires at the connector will be the power wire, with the test light grounded, probe one of the wires - the power wire should light the test light up. If neither wire light the test light then you have an open on the power circuit. You will need a wiring diagram to find out which wire is the power wire and trace it back until you find the open. If the switch is getting power and the brake lights are not illuminating,, the switch is bad and will have to be replaced. A fairly inexpensive part and fairly easy to replace. If you have little or no mechanical experience you may need to get a technician to replace it. The replacement switch may come with instructions on how to replace it. Hope this helps.
Hi Katrina.
The most common wiring for a 7 pin tow-bar plug is as follows.
E.U.Standard
No 1 Yellow-----Left side flasher
No 2 Blue ---- Fog Lights. (Often un-used)
No 3 White --- Earth
No 4 Green -- Right side flasher
No 5 Brown -- Left side park light
No 6 Red ----- Brake lights
No 7 Black--- Right side park light.
The numbers can be found on the rear of the socket.
However---wiring may differ from Europe to the US.
All the best
John
helm inc.
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