back up light

Discussion in 'Lighting Discussion' started by Conlan Rose, Mar 5, 2012.

  1. Conlan Rose

    Conlan Rose Super Moderator

    i just ordered a 55 watt round light for my tahoe for use as a back up light. im just wondering is best way to wire it by splicing the trailer wiring back up light or is there another way.
  2. KidHauler

    KidHauler New Member

    You can tap into the backup circuit, or run a seperate wire and switch.

    The easiest way is probably pulling out the taillight and figuring which wire goes to the backup light - I think it's the white one -then 'T' into it and run down to the new light. Whenever you put it in reverse, the new light comes on.

    Running a whole new wire and switch will be more work and material, but you can use the light whenever you want. (though, most state vehicle laws don't allow for this)

    Mount the light to an existing frame or bumper hole, and you're in business!

    Good luck,
  3. Conlan Rose

    Conlan Rose Super Moderator

    The wiring diagram for the tail lights say back up light wire is light green and I prob gonna attach It through trailer harness cuz it dedicated line to back up switch

    TELORVEHC New Member

    I would tap into the tail light backup wire as mentioned above, but the trailer harness will work too.
  5. Conlan Rose

    Conlan Rose Super Moderator

    ok thanks ill post pics after i get the light mount it and wire it. of course the terminal connectors i ordered and heat shrink tubes arnt coming until a couple days after the lights come in.
  6. chevybulldog6

    chevybulldog6 New Member

    Do you happen to know where this is illegal or know a website to check this out? I have 2 5in spot lights mounted under my rear bumper with a switch in the cab. I had never heard of this being illegal. I am currently stationed in Louisiana and about to move to Texas. I would just like to make sure I am not going to get hit for it. Thanks bud.
  7. KidHauler

    KidHauler New Member

    Most state governments' websites use the common abbrevation, plus ".gov". I tried ' ' and it was the first result.

    In MI, it's called the Michigan Vehicle Code; it'll probably be pretty close to that in your state. Find the search function and look for white light, rear lighting, reverse lights, auxiliary lighting, etc., and you'll find all sorts of stuff you didn't know. For example, in Michigan, any auxiliary light mounted above the center line of the manufacturers headlight must be covered whilst on any public roadway, blue lights anywhere are illegal, except for sworn law enforcement officers, hay wagons more than 6' wide must have at least one rearward facing red light, blah, blah, blah, etc., etc., etc....

    Being called away,
    Good luck,

    I'm back. I'm sure the reasoning behind having aux. backup lights tied into the reverse circuit is so you don't get tempted to flash the bonehead behind you with the hi-beams on. I'm sure, too, that there is a way to wire the lights in so you can have both functions; on when in reverse, plus the switch to use them as work lights. Someone here may know that diagram.

    Depending on the cops in your area, you probably won't have a problem with having the lights mounted out back - just be aware of this, and don't draw attention to yourself, ya know?
    Last edited: Mar 6, 2012
  8. moogvo

    moogvo Moderator

    What you need to do to do it "right" is to connect a RELAY to the reverse light in the tail light harness. Then run a heavier gauge wire from a higher amp rated fuse to actually power the light with... Otherwise, you can melt your taillight harness. It was not meant to provide the power needed for a 55 watt bulb.

    Otherwise, you might get undesired results...


    "I bought a new car once... and I got burned."
  9. Conlan Rose

    Conlan Rose Super Moderator

    funny think is conneticut has laws about aux lights but they never say what the laws are anywhere on the site it was a pain to find i learned there's no rules on back up lights. and i was going to wire it to the trailer harness lead because when i had the shop install the 7 wire harness they didnt realize there was a prewired back up light lead and they didnt use it. so theres nothing hooked up to it im just wondering if the 55 watt light will be to much for the harness lead
  10. Enkeiavalanche

    Enkeiavalanche Moderator

    I have the Whitenight backup lights. Easy plug into a 4 pin harness. It comes with a 3 way switch that allows you to turn it on from behind it or on when backing up. It has a relay inside too... backup lights.jpg
  11. moogvo

    moogvo Moderator

    Yes. Use a relay and a fuse. Its cheap. Less than 10 bux for an off road light relay at the auto parts store.
  12. Conlan Rose

    Conlan Rose Super Moderator

    just wondering what should i get it rated to because the lead is fed from the back up relay directly. that is from what i can tell from the truck wiring diagram.
  13. KidHauler

    KidHauler New Member

    I don't remember how the relays are rated - probably 10-15amps. The OEM relay and wiring for the backup lights are designed for the two factory lights in the taillights, which are what, 27w? Conversely, we all plug our trailers into the 4 flat or 7 round or whatever, adding those extra lights, and no additional relays are needed. The engineers may have already done the math for us.
    You could tap into the 7 plug, and using a relay for the higher amp draw 55w light is a pretty good idea. (Good catch, moogvo)

    Keep us posted
  14. Conlan Rose

    Conlan Rose Super Moderator

    ok thanks ill stop by autozone this week and grab one so i can wire it up this weekend
  15. Conlan Rose

    Conlan Rose Super Moderator

    couldnt for the life of me find the right type of relay but did find nice waterproof fuse holder for a 15 amp fuse. that should be fine in theory right if not id really love to know and also if it not right a nice steer in the right direction would be great like a link or something.
  16. Conlan Rose

    Conlan Rose Super Moderator

    well today i am installing the light since its such a pretty day out side why not ill send pics of the work i do and stuff
  17. Conlan Rose

    Conlan Rose Super Moderator

    OK well installation went off with out a hitch and looks great. The hardest parts were drilling through the bumper and cleaning a part of the frame enought for a good ground.

    This is my truck before the light.
    P3080081.jpg P3080082.jpg

    Here's the location I had to wire in to the 4 flat in there and I had to find the back up lead that I had re taped in earlier this year.

    Here is half way through right after Id drilled through the bumper which was a major pain also was a pain finding right washer combination to make sure the light wouldn't move or wobble. Was really annoyed of how short the lead from the light was.
    P3080085.jpg P3080086.jpg

    This was right before I tested light and hid wiring works great cant wait to see how bright it is at night.

    This is after I hid the wires looks like it was meant to be there also tried to aim it best I could.

    Attached Files:

  18. Nice to see everything went well for you and the new light looks good. Thanks for sharing the pics and if you are able you should get one of it lit up tonight.
  19. Conlan Rose

    Conlan Rose Super Moderator

    Here's the best pic I could snap of the lights. Camera does really bad in low res night shots.

    Here I used the flash so cant see the brightness as well.

    Front of truck with head lights on soon gonna add set of driving lights under the bumper next to the tow hooks.

    This was an attempt to see the illumination of the stock interior lights but it came out really bad.

    Night shot of truck with lights on inside.

    Last pic used flash got fairly good pic.

    Attached Files:

  20. KidHauler

    KidHauler New Member

    Lookin' good! Glad to see you got it up and running.

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