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Hmm..which Guage wire to use??

Discussion in 'Lighting' started by Eclipsed & Floating, May 28, 2017.

  1. May 28, 2017 at 7:54 AM
    #1
    Eclipsed & Floating

    Eclipsed & Floating [OP] Over it.........

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    I bought a light bar from a forum member and the wiring bundle came with only about 8 inches of wires thar were snipped.

    Which Guage wire and fuse do I need to get to the battery, fuse panel, and back to the toggle switch?

    I'm sure it's been asked alot but I can find the answer. There's probably explanatory diagrams out there but I'm weary to just search anywhere.
     
  2. May 28, 2017 at 7:57 AM
    #2
    831Tun

    831Tun heartless Bastrd

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    I'm guessing you should use the same gauge as the existing.
     
  3. May 28, 2017 at 8:04 AM
    #3
    Eclipsed & Floating

    Eclipsed & Floating [OP] Over it.........

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    I would assume this too yet I'm not an electrical guy and aM inquiring on what Guage that is and what size fuse as well
     
  4. May 28, 2017 at 8:06 AM
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    1UPPER

    1UPPER New Member

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    Are you installing the 37" upper hood bulge led now?
     
  5. May 28, 2017 at 8:08 AM
    #5
    Eclipsed & Floating

    Eclipsed & Floating [OP] Over it.........

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    Yes. The weather is starting to shape up and I'm going to start on the mods I'm not 100% confident in my skills
     
  6. May 28, 2017 at 8:11 AM
    #6
    Eclipsed & Floating

    Eclipsed & Floating [OP] Over it.........

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    What's your recommendation on layout of the wiring, a relay, and switch install?

    I've installed some lighting already but had a harness provided that was self explanatory.

    What was your wiring setup with that bar?
     
  7. May 28, 2017 at 8:28 AM
    #7
    Eclipsed & Floating

    Eclipsed & Floating [OP] Over it.........

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    Are you gonna answer the question or ignore the request? Not trying to be a jerk, just inquiring about something you sold me. I've asked 3 times now with no response.

    IM sure you've just missed the questions but still need some sort of response. I guess I'll have to figure it out on my own, which I certainly can do
     
  8. May 28, 2017 at 8:35 AM
    #8
    DVYota

    DVYota Snorked out mall crawler

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    How much power does the light bar pull? Cali Raised LED sells wiring harness with switch and relay for $15.
     
  9. May 28, 2017 at 8:37 AM
    #9
    Eclipsed & Floating

    Eclipsed & Floating [OP] Over it.........

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    Honestly, I don't know. It was a purchase from a forum member that hasn't answered any of the questions Ive asked.
     
  10. May 28, 2017 at 8:46 AM
    #10
    tomsinamerica

    tomsinamerica New Member

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    It's tough to offer advise without understanding what is being lit. I have some tiny LEDs at my house that pull a pretty intense current, so I'm guessing, not all lightbars are created equal.

    As for automotive electronics - although people think it's easy as 12V isn't as hazardous as 110 or 220v... the chances of screwing up are higher... and when you screw up, granted, you don't get electrocuted and thrown across the parking lot... but your car/truck tends to catch fire. Most of the burnt out cars you see (that aren't intentionally set on fire) are caused by electrical issues.. people running too small wire gauge for the load it's carrying or length it's running.

    Without knowing what the load is of the light bar, no-one can tell you what gauge wire to run. Can you get specs from the manufacturer?
     
  11. May 28, 2017 at 8:48 AM
    #11
    Eclipsed & Floating

    Eclipsed & Floating [OP] Over it.........

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    Not sure what the manufacturer is, but your reasoning for gathering that info is the exact reason I'm asking questions. I'm not trying to burn up my truck. I need the guy that I bought it from to answer my questions
     
  12. May 28, 2017 at 8:55 AM
    #12
    tomsinamerica

    tomsinamerica New Member

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    so i've no idea who you bought it off or what your deal was but in his defense, there are some things that i've bought and then sold that i wouldn't have remembered the specs for...

    As an alternative, take a look at some expensive versions of the light bar you have... in general, the more expensive, the more powerful & therefore more current it will pull. Some of them may even state a minimum wire thickness to use, like you find on amplifier specs. If you copy those, you should be good even if yours isn't as powerful as those. (better to be safe than sorry)

    As for wiring it in... I don't think you'd want to run full thickness through the firewall to a switch so you need to use a relay, I'd power that off 12v switched so that it will only light when the ignition's on. Place the relay close to the lightbar/battery so that you minimize your lengths of heavy gauge wire. Make sure the relay is rated to power the load of the lightbar.

    I'm sure someone else will chime in with more experience than me in terms of lightbars... I've never installed one and probably never will... I have added a few electrical devices to a few cars though.


    P.S. Make sure you fuse the 12v sw supply and the 12v constant from the battery. Inline fuses are probably the easiest.. on the relay supply, you need a super small load rating and on the lightbar supply, use one that is slightly higher than the estimated bar rating... If you fuse things correctly - no (much less) chance of fire.
     
    Last edited: May 28, 2017
  13. May 28, 2017 at 9:01 AM
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    1UPPER

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    Sorry I just saw your post. I was with family for church. Dang bro
     
  14. May 28, 2017 at 9:12 AM
    #14
    Eclipsed & Floating

    Eclipsed & Floating [OP] Over it.........

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    Please do, Ron. That's a great quick description though. It gives me something to work with
     
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  15. May 28, 2017 at 9:14 AM
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    1UPPER

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  16. May 28, 2017 at 9:15 AM
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    Eclipsed & Floating

    Eclipsed & Floating [OP] Over it.........

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    Thank you sir. That's exactly what I needed
     
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  17. May 28, 2017 at 9:19 AM
    #17
    Eclipsed & Floating

    Eclipsed & Floating [OP] Over it.........

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    That helps. Like I said before, I can do the work as long as I know what to use.

    Thanks Ron!!!!
     
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  18. May 28, 2017 at 9:22 AM
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    Eclipsed & Floating

    Eclipsed & Floating [OP] Over it.........

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    You can bring me some beer.....I'll share em with you. :D
     
  19. May 28, 2017 at 9:33 AM
    #19
    Eclipsed & Floating

    Eclipsed & Floating [OP] Over it.........

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    Nope.
    I'm sitting on the porch waiting. If you're not here by dark our friendship is going to deteriorate
     
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  20. May 28, 2017 at 9:39 AM
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    Eclipsed & Floating

    Eclipsed & Floating [OP] Over it.........

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    SELLER MADE GOOD!!! He didn't see my questions so my frustration was just in my head, not due to his actions.

    Thanks bro!!
     
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  21. May 28, 2017 at 9:47 AM
    #21
    Black Wolf

    Black Wolf INCOGNITO undercover toyomafia

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    I love happy endings...[​IMG]
     
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  22. May 28, 2017 at 9:54 AM
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    Eclipsed & Floating

    Eclipsed & Floating [OP] Over it.........

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    Matt,
    Agreed. Now we just need @RowdyRon to keep his promise and get here with beer! It's not gonna be quite the happy ending if I stay thirsty too long
     
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  23. May 28, 2017 at 10:16 AM
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    TundraTex

    TundraTex FRAC On!

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    Here's a quick diagram I drafted up for you. The fuse sizes are notional.

    For the Switch line, a 1 or 2 Amp Fuse is plenty. I normally use 16ga wire for Switch lines.

    For the Light Bar power line to the Relay, pick your Fuse and wire size per the chart. A 20Amp fuse and 10Ga wiring to the Battery is pretty common. Check your light bar for a manufacturer sticker or stamp with info on power requirements.

    LightBar.jpg
     
  24. May 28, 2017 at 10:38 AM
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    BlueBottle

    BlueBottle not a PRO

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    See fine print
    Also it doesn't hurt to use a bigger gauge then needed. So in reality you could have used a 12 gauge to be safe.
     
  25. May 28, 2017 at 11:09 AM
    #25
    Eclipsed & Floating

    Eclipsed & Floating [OP] Over it.........

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    Thanks man!! Super helpful
     
  26. May 28, 2017 at 11:30 AM
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    mdavis

    mdavis I need a beer.

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    This. @RowdyRon knows ohms law. :thumbsup:
    IMG_1354.jpg
     
  27. May 28, 2017 at 5:23 PM
    #27
    TundraTex

    TundraTex FRAC On!

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    Actually, when it comes to wire gauge sizes, the larger the gauge, the smaller the wire. So the next size larger than 10ga is 8 ga. 180 watts/12Volts = 15 Amps. Fuses are labeled at their nominal continuous rating, and should be sized for a 25% surge margin. So I would use 10 ga wire with a 20 Amp fuse.
     
  28. May 28, 2017 at 5:24 PM
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    Eclipsed & Floating

    Eclipsed & Floating [OP] Over it.........

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    Damn...I know it's surprising to all but it would seem there are a ton of people on here that are smarter than me.

    Yeah, I know. I'm surprised too
     
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