Question about 2002 GMC Sierra

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Where to hook up an extra red wired that comes out of the switch

I just bought a pair of fog lights for my 2002 GMC SIERRA the wirering comes with do red wireds do not know where to connect a red wired that comes out of the swicht section i allready have and other red wired hook up to the battery with its ground is just that extra red wired do not know where to connect it

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Does the wire go to key power to light up the switch when the key is on.

Posted on Apr 24, 2009

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Posted on Jan 02, 2017

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I bought some halo driving lights for my '03 GMC Sierra 1500, they came with a wiring harness, switch and everything needed for installation except for installation instructions. Help PLEASE!


Tools recommended for this job: wire stripper, wire crimper, volt meter, 4x quick wire connectors, 4x male crimp connectors, 4x female crimp connectors
  1. First, tape the halo and/or LED wires to the back of the headlights to keep them from tangling.
  2. Keep the pairs in order by their color, e.g. black, black (ground) and Red, Red (positive). Note: positive and ground wires might not always be black and red.
  3. Remove some of the plastic shielding at the end of the wires to expose enough copper wire, next twist the copper together to strengthen it.
  4. Shove the twisted copper into a crimp connector; crimp the location where wire and the connector end overlaps, wrap with electrical tape to secure it.
  5. Two extra wires in black and red will be helpful to make the halo/LED wire longer to easier installation. Remove shielding: show copper: use the connectors: connect the positive and ground from the headlights.
  6. Next step, turn the headlights inside the car to the [on] position.
  7. Take the volt meter and connect the negative to the negative on the battery (please use extreme precaution when doing so).
  8. The headlight harness usually will have [3] wires, generally red, black, green (headlights, ground, turn signal). Use the volt meter to test which wire will have power running through it (since the headlight is in the [on] position) which will be the headlight wire.
  9. Use the quick connector to connect the extra wires (red) to the power wire on the harness and black to the ground. This will split the current coming from the harness. Crimp the connectors and use electrical tape to secure it.
  10. Now connect the projector headlight halo wires and the harness from the car.
  11. No wires should be left over unconnected.
  12. The installation is now complete.

Jan 14, 2011 | GMC Sierra 1500 Cars & Trucks

2 Answers

Fog lights stop working


There is no provision for fog lights in your vehicle.

Mar 27, 2017 | 2001 Jeep Wrangler

2 Answers

My 2002 gmc Sierra's low beams will not work but my drl high beams and fogs work fine....


check your headlamp switch.is your switch on the dash or part of the turn signal switch.gm have a thing with plastic switches and metal contacts these switchs have a tendency to melt..also check for grounds.was the vehicle in a accident involving the front end.if you changed your headlamps to 80/100 watts bulbs.the circuit breaker may not work hence the switch melts.

Jun 23, 2010 | Cars & Trucks

2 Answers

2002 GMC sierra brake lights not working. Reverse and blinkers ARE working!


Check fuses first. If thats OK, could be a problem with the brake switch (down by the pedal) or the wiring.

Mar 26, 2010 | 2002 GMC Sierra

1 Answer

I have a 2002 GMC sierra 1500. Instrument Lights Not Working


When dash lights don't work odds are the tail lights don't work either.Sounds like Dimmer switch may be a problem.

Oct 02, 2009 | 2002 GMC Sierra 1500

1 Answer

Fog lights not turning on


Sounds good to me except, the switch light shout be on the relay primary circiut and light off until you turn it on. When you turn the switch on, it lights up and energizes the relay, the relay closes and completes the secondary circiut for ythe fog lights. VIOLA' I have a silverado. done deal thanks

May 28, 2009 | 2003 GMC Sierra

2 Answers

Factory radio wiring color codes


Here ya go. enjoy!
2002 GMC Sierra C1500 Car Radio Wire Color Codes
Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black/White
Car Radio Illumination Wire: Brown
Car Stereo Dimmer Wire: Gray
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: Under the center console.
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue

May 14, 2009 | 2002 GMC Sierra 1500

1 Answer

Fog Lights won't work


Definitely a ground. Clean everything with light sandpaper. Follow any/all wires and see where it grounds, clean there too. If all else fails, run a new ground wire from the frame to the exact spot you got the bulbs to work (a workaround that usually remains permanent on my cars!).

Aug 07, 2008 | 2002 GMC Sierra

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