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Old 01-02-2014, 08:12 PM   #1
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Question Some Electrical Knowledge needed.

My younger brother is selling a new brand of LED light bars and is offering me hugely discounted prices to install them on my truck and show them off. I can wire everything up no problem but I don't know the math behind it and I'm having a hard time finding any answers through Google. I apologize if similar has been addressed. I did try searching the forum but didn't find anything close to my situation.

I plan on installing:
two 2" lights with a 3 amp combined draw
two 6" lights with a 3 amp combined draw
one 10" light with a 2.5 amp draw
two 20" lights with a 20 amp combined draw
total 28.5 amp draw.

I plan on wiring them based off this diagram. The blue wire will be tied into my high beams. The gps and vest etc listed will obviously be lights.


I've found that 12 gauge wire will handle a max of 41 amps. The relay switch is a max 40 amp.

I'm wondering what size fuse I should be placing in my inline fuse holder and if I use 12 gauge wire, if this wiring setup will be safe. Any suggestions or notes on what I'm missing?

I'm installing these lights on my 2008 Dodge Ram 1500 SXT Quad Cab, everything has been left stock under the hood, also wondering if I'll need an alternator upgrade for this project.

Thanks for your time!

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Old 01-02-2014, 08:40 PM   #2
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Your alt should be fine as for the fuse you want to use the lowest amp fuse to your load being applied

Also 12 gauge wire if using crimp connectors will heat up solder the ends or use 10 g wire with crimps
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Old 01-02-2014, 08:45 PM   #3
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I would not run more than a 30 amp fuse in the inline holder. Anything more than that you are allowing the wire to be the fuse.....

Why are you wanting these to only come on with High Beams?

If I were you, I would install a dash mounted switch. Use a 30-Amp in-inline fuse. Eliminate the Blue Wire and where the relay is put the switch.

I personally run a 10 gauge wire to a distribution block and switch individual banks. I currently have 3 switches that control interior, exterior, and bed lighting.
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Old 01-02-2014, 09:18 PM   #4
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Quote:
Originally Posted by cruel1 View Post
I would not run more than a 30 amp fuse in the inline holder. Anything more than that you are allowing the wire to be the fuse.....

Why are you wanting these to only come on with High Beams?

If I were you, I would install a dash mounted switch. Use a 30-Amp in-inline fuse. Eliminate the Blue Wire and where the relay is put the switch.

I personally run a 10 gauge wire to a distribution block and switch individual banks. I currently have 3 switches that control interior, exterior, and bed lighting.
Thanks for the info on the fuse.

Originally wired directly to my headlights because I didn't want extra interior switches. I found most were ugly and way too big. I have found some pretty nice switches though lately and am considering it. I also wanted all my lights to come on at once rather then flicking several switches. The lights will all be forward facing or slightly to the sides to light up the ditches.

with your setup I'm guessing you have 10 gauge to your dist block then smaller from your block to switch then lights?
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Old 01-02-2014, 09:23 PM   #5
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Personally, I would have a fuse on each idivdual items power leg also. If there is a problem with any one item the way you have it now, you will not know which one blows the main fuse. With a fuse on each line you are completely protected.
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Old 01-02-2014, 10:12 PM   #6
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Quote:
Originally Posted by kcd1369 View Post
Personally, I would have a fuse on each idivdual items power leg also. If there is a problem with any one item the way you have it now, you will not know which one blows the main fuse. With a fuse on each line you are completely protected.
A fused power distribution block like this would work nice for that. I have seen them somewhere with plastic covers also. And keep the main fuse right off battery as you drew it.

Good Luck!
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Old 01-02-2014, 10:38 PM   #7
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Thanks everyone for your responses. Got some great info and new ideas. Ill post some pics once I get it all done.
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Old 01-03-2014, 02:07 PM   #8
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This is the basic setup I use to power accessories.
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Old 01-03-2014, 02:46 PM   #9
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Originally Posted by Redtruck-VA View Post
This is the basic setup I use to power accessories.
Now that's what I'm talking about. Greg where do you get your components from? Mainly the Fuse block?
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Old 01-03-2014, 02:59 PM   #10
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Originally Posted by kcd1369 View Post
Now that's what I'm talking about. Greg where do you get your components from? Mainly the Fuse block?
I got the block and relays at Advance Auto Parts, but I suspect any local parts store should have them.
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