Full Size K5 (1969-1991) GMT415 (1992-1994) Tech Discuss any and all full size K5 general tech topics here.

brake light switch wiring diagram?

  #1  
Old 09-21-2014, 02:48 PM
Starting Member
Thread Starter
Join Date: Dec 2009
Posts: 178
Jonas is on a distinguished road
Default brake light switch wiring diagram?

Hello All

I got some problems with a 87 k5 id like to ask about...

im having non existant brake lights at the moment..Dont know when they went dark since its the only light thats not working...

i have power to the brake switch and it also works sending power in the white cable coming from it..

Now i wonder where this white cable is heading.. some googles say it goes to the headlight switch, some say it goes into the turn signal harness..

Does anyone have diagrams of this cable or know where its supposed to go?

I have to have the car for inspection in 5 days, so right now im thinking just to splice a cable from the white one off the brake switch but I also want the real solution :=)

Thank you !
 
  #2  
Old 09-21-2014, 04:10 PM
swartlkk's Avatar
Administrator
Join Date: May 2005
Location: Waterloo, NY
Posts: 40,792
swartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond reputeswartlkk has a reputation beyond repute
Default

The rear brake and turn signals use the same bulb filament so splicing a wire will not result in the proper operation of both systems.

Do your turn signals work?


Here are a bunch of diagrams I found through a quick Google search for "1987 K5 Wiring Diagrams" which are hosted by 73-87ChevyTrucks.com:
81-87 Cab Interior Page 1
81-87 Cab Interior Page 2
81-87 Chassis and rear Lighting
81-87 Front Lighting
81-87 I6 Engine Compartment
81-87 V8 Engine Compartment
81-87 Instrument Panel Page 1
81-87 Instrument Panel Page 2
81-87 computer control wiring
power windows wiring


Cab Interior Page 2 shows the brake switch and the turn signal switch. Circuits 18 & 19 are feeds to the back of the truck for the left & right turn/stop lamps respectively.
 
  #3  
Old 09-22-2014, 03:59 AM
Starting Member
Thread Starter
Join Date: Dec 2009
Posts: 178
Jonas is on a distinguished road
Default thanks

Hi Swartlkk,

Thank you, youre a better googler then me

I was thinking of pulling 12volt from the white wire running from the brake switch... only to the brake lights as an emergency fix.. I know that the bulb has two filaments, the 1st one is working fine its only the brake filament that is not lighting up.

I can see from your kindly googled diagrams that its indeed going into the turn signal contact in one of the corners...

That should help me follow the wire and try to findout why its not working..

Yes, my turn signal lights work just fine :=)

il save these diagrams now so i always have them with me!
 
  #4  
Old 10-01-2014, 03:24 PM
Starting Member
Thread Starter
Join Date: Dec 2009
Posts: 178
Jonas is on a distinguished road
Default

Problem solved

Pulled a new cable from the turn signal connector back to my tail lights, all good now

Thank you swartlkk for the diagrams that helped a lot

BR Jonas
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
phxjosh
2nd Gen S-series (1995-2005) Tech
4
10-30-2013 10:03 AM
nepa zr2
Lighting & Electrical
7
02-25-2012 10:38 AM
86FIFI
Lighting & Electrical
2
09-26-2011 09:12 PM
SCBlazer96
2nd Gen S-series (1995-2005) Tech
3
04-16-2010 08:39 PM
filoblazer
2nd Gen S-series (1995-2005) Tech
5
10-23-2009 11:45 PM


Thread Tools
Search this Thread
Quick Reply: brake light switch wiring diagram?


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.