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09-20-2019, 01:18 PM
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#1 |
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Registered User
Join Date: Nov 2017
Location: Anthem AZ
Posts: 280
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3RD brake light issue
Hi all, happy Friday.
I purchased an LED 3rd brake light from Robznob11 and installed it. WORKS GREAT WHEN STOPPING! only if the driver or passenger door is open. ??? wired it into the brake light switch white wire. 1970 c10 2wd. any suggestions? |
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09-20-2019, 01:23 PM
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#2 |
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Registered User
Join Date: Feb 2018
Location: Doland SD
Posts: 836
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Re: 3RD brake light issue
Is it grounded though the door swiches? That's my only gess
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 ( second times the charm) 71 gmc c15 307 sbc 373 rear gears positrac sm 465 trans. ( not listed on spid but is original )94 chevy k1500 350 tbi 373 rear gears 4l60e one wheel peel. Gutless 07 gmc sierra classic rcsb 4.3 lt 5 speed w/t 04 chevy Silverado 1500 ext cab 5.3 4l60e. 81 chevy Scottsdale k10 muncie sm465 Np208 10 bolt 8.2 ( Old Green) |
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09-20-2019, 01:24 PM
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#3 |
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Registered User
Join Date: Aug 2016
Location: Lake Forest, CA
Posts: 2,177
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Re: 3RD brake light issue
If I read this right, for some reason its using the same ground as the courtesy lights. If so, when the doors are closed, there is no ground for the light - that is why. You have to ground the light separate from the courtesy light circuit.
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"Work hard, use your vacation days." 1970 C15 GMC Long Bed 1986 C20 Scottsdale 1983 K2500 Sierra Classic Suburban 6.2 Instagram: C10sofOC |
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09-20-2019, 01:55 PM
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#4 | |
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Registered User
Join Date: Nov 2017
Location: Anthem AZ
Posts: 280
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Re: 3RD brake light issue
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09-20-2019, 01:55 PM
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#5 | |
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Registered User
Join Date: Nov 2017
Location: Anthem AZ
Posts: 280
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Re: 3RD brake light issue
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09-20-2019, 02:41 PM
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#6 |
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Registered User
Join Date: Dec 2007
Location: Glendale Arizona
Posts: 1,354
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Re: 3RD brake light issue
You could just drive with the doors open just a thought.
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1970 GMC 1500 stepside 1972 GMC Jimmy Custom 2004 Chevy Colorado 1989 Swb Silverado 1972 Aj's Stormer |
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09-20-2019, 03:41 PM
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#7 | |
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Registered User
Join Date: Nov 2017
Location: Anthem AZ
Posts: 280
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Re: 3RD brake light issue
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09-20-2019, 09:13 PM
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#8 |
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Senior Member
 Join Date: Aug 2019
Location: Cheraw
Posts: 1,305
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Re: 3RD brake light issue
Did you replace the brake pedal switch to a 3 wire? You need a dedicated circuit going to the 3rd brake light.
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09-20-2019, 09:43 PM
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#9 | |
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Registered User
 Join Date: Jul 2015
Location: 2nd left past the stump on a dirt road.
Posts: 2,629
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Re: 3RD brake light issue
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09-20-2019, 09:43 PM
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#10 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Re: 3RD brake light issue
I just installed mine a few weeks ago and I also had to change the ground wire to the back of the screws holding it in place.
My link on installing it.  http://67-72chevytrucks.com/vboard/s...d.php?t=790874
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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10-21-2019, 05:04 PM
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#11 |
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Registered User
Join Date: Nov 2017
Location: Anthem AZ
Posts: 280
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Re: 3RD brake light issue
[QUOTE=Andy4639;8596571][B][COLOR="Red"]I just installed mine a few weeks ago and I also had to change the ground wire to the back of the screws holding it in place.
FINALLY got around to changing the ground. I did what Andy4639 suggested and now i don't have to open the door when stopping to make the third brake light work. Thank you for your help fellas as usual. |
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10-22-2019, 12:12 PM
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#12 | |
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Special Order
  
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,862
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Re: 3RD brake light issue
[quote=elorenzof;8613605]
Quote:
"Watch out Harold! Looks like we have a loony ahead of us getting his nerve up to jump out of his truck. This is the third time he has opened his door but decided to stop"
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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10-25-2019, 09:16 AM
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#13 | |
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Registered User
Join Date: Dec 2007
Location: Glendale Arizona
Posts: 1,354
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Re: 3RD brake light issue
[quote=special-K;8614121]
Quote:
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1970 GMC 1500 stepside 1972 GMC Jimmy Custom 2004 Chevy Colorado 1989 Swb Silverado 1972 Aj's Stormer |
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