How to fix brake switch (not replace)

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

Doubeleive

Wes
Supporting Member
Joined
Nov 7, 2017
Posts
20,297
Reaction score
27,928
Location
Stockton, Ca.
Thank you for this ,, you’ve described my issue almost to a T ,, on my 06 Yukon my top brake light still works but cruise and tail light brakes are not functional,, would you say I have the same issue ?
check all your fuses first, otherwise you may have a short in the tail light wiring or brake light harness or bulb socket, remove both tail lights and inspect and clean the bulb sockets and check for power with a meter if no power at the socket/s trace forward from there until you find the problem.
if the 3rd (high brake light) is working then the brake switch is good. The cruise function is finding a problem somewhere else, my guess is a fuse or wiring issue causing high or low ohm's on the circuit. If you find a blown fuse and the replacement blows again then this would also indicate a short, water intrusion, etc.
 

clandr1

Full Access Member
Joined
Apr 20, 2012
Posts
850
Reaction score
817
Location
DFW, TX
Thank you for this ,, you’ve described my issue almost to a T ,, on my 06 Yukon my top brake light still works but cruise and tail light brakes are not functional,, would you say I have the same issue ?

Did you install LED brake light bulbs? I've seen this causes the issue you describe if you don't include an inline resistor of some sort.
Additionally, does your horn work?
 
Last edited:

Mark Elliott

TYF Newbie
Joined
Jan 1, 2019
Posts
11
Reaction score
7
Did you install LED brake light bulbs? I've seen this causes the issue you describe if you don't include an inline resistor of some sort.
Additionally, does your horn work?
No LEDs and I’ll check my horn when I finish work
 

Mark Elliott

TYF Newbie
Joined
Jan 1, 2019
Posts
11
Reaction score
7
So I checked the 2 fuses that I figure could have something to do with it ,, cruise and the stop fuses are both good ( and my horn works )
 

Mark Elliott

TYF Newbie
Joined
Jan 1, 2019
Posts
11
Reaction score
7
So I checked the 2 fuses that I figure could have something to do with it ,, cruise and the stop fuses are both good ( and my horn works )
Just as a side note I only checked fuses at the drivers door panel ,, would there be a controlling fuse under the hood ?
 

Forum statistics

Threads
124,146
Posts
1,727,771
Members
85,723
Latest member
bsully456
Top