1. Welcome to PlowSite. Notice a fresh look and new features? It’s now easier to share photos and videos, find popular topics fast, and enjoy expanded user profiles. If you have any questions, click HELP at the top or bottom of any page, or send an email to help@plowsite.com. We welcome your feedback.

    Dismiss Notice

2500HD questions

Discussion in 'Chevy Trucks' started by TrailK10, Mar 25, 2003.

  1. TrailK10

    TrailK10 Member
    from NH
    Messages: 74

    on my 02 there is a switch for aux. lamps when i hit the switch no lights go on. what is this switch for? also there is a wiring harness near the gas tank w/ tape on it what is this for thanks alot.
     
  2. LB Landscaping

    LB Landscaping Senior Member
    from Maine
    Messages: 324

    The switch for Aux lamps is for roof clearance lights. If you did not get them as an option GM still wires the truck so they are easy to add. Not sure what the the wire harness by the tank is for.
     
  3. wolfie

    wolfie Senior Member
    Messages: 174

    The clearance lights if you have them come on with the headlights... the aux. light swittch is for a roof beacon... it's part of the plow prep package. the wiring should be up in the roof and there ia a relay in the pillar.. you can hear it click when you push the switch.
     
  4. myo

    myo Senior Member
    Messages: 193

    Yeah, wolfie is right. It is the power switch for when you put a lightbar on the roof or beacon.
     
  5. Got Grass?

    Got Grass? Senior Member
    Messages: 641

    do a search for "03 aux light switch" & you will find TONS of info about them & the problems people have had.
     
  6. sonjaab

    sonjaab PlowSite.com Addict
    Messages: 1,425

    Trail............The wire set up near the gas tank is
    the 5th wheel hookups (i forget the option code).
    The aux. light switch is indeed for the roof beacon.
    The wires run up the rear drivers side pillar. Thats
    where the relay is. The wires are deadheaded up
    in the headliner. Check out this link for set up.
    https://www.gmupfitter.com/secure/html/publicat/bull/bull27.pdf
    ...............geo
     
  7. TrailK10

    TrailK10 Member
    from NH
    Messages: 74

    thanks for all the info. what do you guys run for becon lights? im thinking of building a headache rack and mounting it on top of the rack.
     
  8. JohnnyU

    JohnnyU 2000 Club Member
    Messages: 2,040

    I just did the same. I haven't bought my new lights yet.
    I'm planning on getting the Federal Signal Highlighter.

    Rack Construction Page

    -John
     
  9. sonjaab

    sonjaab PlowSite.com Addict
    Messages: 1,425

    TRAIL........I use a magnetic one from napa. I put 2
    female ends on the truck wiring and male ends on
    the beacon.
    I lead them outta the headliner plug it in and lead
    the wires out the door jamb. Then tuck the wires
    back in the headliner when not needed.......