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wiring a new boss, where to drill firewall?

Discussion in 'Boss Plows Discussion' started by Onebadbowtie86, Oct 26, 2008.

  1. Onebadbowtie86

    Onebadbowtie86 Senior Member
    Messages: 114

    hey guys, i spent the day wiring my new boss plow, and it went together pretty simple, easier then i thought, but i need to know where abouts you are supposed to drill the hole in the firewall? if any of you could explain where yours is on a 99+ bodys style chevy/gmc it would help me out alot, pictures would be even better!!! thanks in advance!

  2. 042500hd

    042500hd Senior Member
    Messages: 251

    You may have a hole pre-drilled. It will have a grommet installed that you need to cut and send your wires through. What make and model do you have?
  3. 06HD BOSS

    06HD BOSS 2000 Club Member
    Messages: 2,611

    i actually ran mine through the large grommeted hole that one of the main harnesses already runs through. its sort of near the steering colum. just ran a snake from inside the cab, through the grommet into the engine bay, and pulled the wires through that grommet.
  4. Onebadbowtie86

    Onebadbowtie86 Senior Member
    Messages: 114

    i seen that grommet that the factory harness goes through by the firewall, but didnt know if i could get the boss harness through it, heres a picture of my truck im putting the plow on

  5. flanny0104

    flanny0104 Junior Member
    from indiana
    Messages: 17

    driver side factory wiring hole is what i used for mine, cut back the rubber grommet and slide it through! good luck.
  6. 06HD BOSS

    06HD BOSS 2000 Club Member
    Messages: 2,611

    nice truck, thats gonna be very handy in tight driveways. my girlfriends father has the same style in a chevy with a step-side bed
  7. wild bill

    wild bill PlowSite.com Addict
    Messages: 1,239


    don't know what year yours is ,this is for a 2001 2500hd .there was a flat spot with a dimple ,had to use a hole saw pull the insulation aside ,make sure nothing on the back side and go for it .some pic's.




  8. flykelley

    flykelley 2000 Club Member
    Messages: 2,127

    Here is my 05, had to drill my own hole. You will need to drill it from inside the cab. Send me your email address and I will email you some pictures. flykelley930@mac.com Put firewall hole in the subject line.

    Good Luck Mike
  9. Snowchief

    Snowchief Member
    Messages: 44

    If you choose to run it through an existing grommet that's already full of wiring, then pour isopropyl (rubbing) alcohol on everything and it'll slide right through. It's a terrific lubricant for pulling wires. And it dries up quickly.

    And get your minds out of the gutter... (my preemptive strike)