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Unread 05-15-2013, 10:23 PM   #1
VTEK1
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Electrical wiring for lightbar

Okay, so I have a new lightbar on the way, and I have some good experience with wiring. My idea involves these 27W LED fogs i got for the light bar. I would like to wire 2 lights to one relay or 1 relay per. Hella has this nice little box which I'm going to mount under my driver's seat that houses 4 relays. I plan on using the typical 5 pin dual 87 relay with 30 amp fuses on every light.

http://www.amazon.com/HELLA-H8496009...?ie=UTF8&psc=1


http://www.amazon.com/HELLA-H8498800...?ie=UTF8&psc=1

All the wiring will be 12-10 gauge, except the trigger wires for the relay. Just looking for a nice, SAFE, install and keep it clean. Run the switches to either my center console, or under the dash where I have a 3 switch setup.

I hope this isn't too confusing to understand. Def open for suggestions but pretty set in my ways about using relays. I just don't know if I can use two lights on one relay to save space or should use 1 relay per light.

Thank you for your time.

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Unread 05-15-2013, 10:57 PM   #2
chriskeenan
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you could wire them all on one relay. each light is only using 2.4 amps at most. unless you want individual control of each light or each set, save the relay space for other accessories if you can, there's no sense in wasting capacity.

http://www.supercircuits.com/resourc...amps-converter
voltage will be ~11.8 with the engine off and ~13.2-13.8 with the engine running.
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Unread 05-15-2013, 11:03 PM   #3
VTEK1
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WOW really????
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Unread 05-15-2013, 11:07 PM   #4
chriskeenan
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Originally Posted by VTEK1 View Post
WOW really????
yes really, watts/volts=amps
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Unread 05-15-2013, 11:13 PM   #5
chris87xj
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I don't see any real issues with your wiring plan, but it seems more aligned to old skool auxilliary lighting needs and doesn't take advantage of the lower power needs of LED lights. 10-12ga wire and 30amp fuses is way overkill but better than undersized.
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Unread 05-16-2013, 05:16 AM   #6
VTEK1
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yes really, watts/volts=amps
I thought you had to figure in resistance with that. I mean apprently I'm making more difficult.

Is there an easier way to wire it up?? I'm trying to figure out a nice clean way to run the wiring to the roof so any suggestion (pictures especially) would be greatly appreciated.
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Unread 05-16-2013, 08:58 AM   #7
chriskeenan
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Quote:
Originally Posted by VTEK1 View Post
I thought you had to figure in resistance with that. I mean apprently I'm making more difficult.

Is there an easier way to wire it up?? I'm trying to figure out a nice clean way to run the wiring to the roof so any suggestion (pictures especially) would be greatly appreciated.
That formula assumes a no resistance/perfect world scenario.

Resistance will come from the wire length, wire gauge or circular mils, and conductor material, it can be used to calculate voltage drop. voltage drop will be the difference between the voltage at the lights and the voltage at the battery. As the voltage decreases the required amperage will go up. Unless you're planing on using very long lengths of wire (100+ft) or very small wire voltage drop won't be a problem. The OEM XJ headlamp wiring is a good example of voltage drop from small gauge wire.
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Unread 06-05-2013, 10:47 PM   #8
VTEK1
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Thanks for the help guys, used 12 and 14 gauge wire and only used 2 relays. Thanks for the advice and input. Here's the final product.
img_0055.jpg   img_0059.jpg  
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Unread 06-06-2013, 08:24 PM   #9
sAe23
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So, how did you route the wires??
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Unread 06-06-2013, 10:31 PM   #10
VTEK1
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I wired and left bank and right bank for the lights. So left 2 and right 2 lights are on seperate switches. I work on an ambulance so have left and right flood lights is something I have really found useful. So I ran from the lightbar, behind the weather stripping, down to boot and cut a very small slit in it, just enough to fit two wires, back to under my driver seat where you can see my fuse and relay block. Using the spot where airbag module use to be before they had a recall and placed it under the center console. Last pic is the switches the middle are for the front two on bumper, and left and right for each bank.
img_0067.jpg   img_0070.jpg   img_0069.jpg   img_0065.jpg   img_0066.jpg  

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Unread 06-06-2013, 10:32 PM   #11
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The power from the battery to relays comes from the battery, through firewall and under the seat, obviously. Hope this helps.
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