Wiring up the lights

Discussion in 'Assembly discussion' started by Rob Schwiesow, Jun 5, 2017.

  1. Rob Schwiesow

    Rob Schwiesow Member

    Hey guys, this is Rob from Grundy Area Vocational Center. I work with Andy, who has pretty much handled all of the updates. I have been in charge of the wiring for most of the build. Quick update, the car runs and drives awesome, now I am moving on to the lighting. I did not unbox the headlights, taillights and turn signals, and was told there was no wiring diagrams in the boxes. So my question is, does anyone have diagrams or an explanation as to which wire does what ie.. brake lights, running lights, turn signals, reverse light etc.. I have the factory diagrams for the cobalt so I am not worried about that, just trying to save myself some time. Thank you in advance.

    Rob from GAVC

    P.S. will post updated pictures soon.
     
  2. Tony

    Tony Well-Known Member

    I'm sure you've gotten it figured out by now, but I figured I'd reply to help anyone with the same question in the future (as I went through the same investigation last weekend). On the tail end, there are five wires plus ground. Brown is park/tail lights (also powers the license plate lamp if you have one). Light Blue is the center mount stop lamp, which is separate from the other stop/brake lights because the BCM integrates stop and turn on the outer lamps. Light green is reverse, dark green is right turn/brake, and yellow is left turn/brake.
     
  3. canyon bolieu

    canyon bolieu Active Member

    Having a strange problem. When I hook my driver side turn signal wire (yellow) to my brake wire (light blue) then to the brake wire (red) on the taillight I’ll push the brake and then release but the light will stay on but if I take the turn signal wire (yellow) off it will work like normal. Do you have your turn signals hooked up to the reverse lights???
     
  4. canyon bolieu

    canyon bolieu Active Member

    I guess this will just be the official thread on lights if anyone has pics of how they wired all the lights up or ran the wires post it up. Still need some info on the mirrior turn signals and headlights thanks guys
     
  5. BAR-AIR

    BAR-AIR Well-Known Member

    Good Evening,
    I wasn’t able to move a picture over from my build log but take a look at page #25 on my log. It has a simple diagram of the headlight block and some notes on the taillights and mirrors. Hope it helps.
    Bruce
     
  6. Briann1177

    Briann1177 Well-Known Member

    Your front lighting circuits are different than the rear lights. Also, none of the lighting circuits should be connected to one another. For example, turn signals shouldn't be hooked up to reverse lights.
     
  7. BAR-AIR

    BAR-AIR Well-Known Member

    Maybe I’m missing something. Yes the front lighting circuit is entirely different then the rear circuit and yes you can not connect one to the other. The headlight block is entirely used for the front lights and signals. (Actually set it up as a separate harness going to the front of the car) and yes I did combine the low beam/high beam wires (drivers/passengers sides) going to the headlight just to reduce a couple of wires in the harness. -good bad don’t know but seems to work just fine- the only other thing in the diagram that is noted is a long purple wire that is connected with the low beam headlights (seems in most cars it is melted down that wire was shortened and re connected to itself. The diagram gives the wires and color codes for a 2008 Cobalt LT completely wired and working.
     
  8. Karter2026

    Karter2026 Active Member

    The blue wire is CHMSL ( 3rd brake light) and should not be hooked to anything but a 3rd brake light. The yellow from the harness should go to the red wire on the tail light (driver side). The green wire should go to the red wire on the light on the passenger side
     
  9. Rob Schwiesow

    Rob Schwiesow Member

    Hey Guys, This is what Adam sent me a while back, this solved all of my issues. My harness was good, I was just having issues because I didn't know which was which for the lights themselves. I have the wires coming out of the back of my lights

    From Adam:
    If you have the red connectors, the wiring is like this:
    • Bottom connector:
      • white: ground
      • red: stop/turn
      • black: tail light
    • Top connector
      • white: ground
      • red: reverse
      • black: unused
    If your light has wires coming right out of the tail light:
    • Bottom three wires:
      • white: ground
      • red: stop/turn
      • black: tail light
    • Top two wires
      • white: ground
      • red: reverse
     
  10. Rob Schwiesow

    Rob Schwiesow Member

    I can post a rear light wiring diagram if it would be helpful
     
  11. canyon bolieu

    canyon bolieu Active Member

    Yeah why not any info, pics, comments or anything else post it in this thread it will help someone some day and lonny and Adam will get less calls haha
     
  12. Rob Schwiesow

    Rob Schwiesow Member

    That is for a 2010, I am not sure if the wiring was the same from 2005-2010 but they should be similar.
     

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