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Old 01-04-2014, 07:28 AM   #1
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Auxilary light wireing

I have a 2009 Jk . I am installing two 6 inch 70 wat Led lights. I purchased the Rugged Ridge pillar mount Pod and switchs. My question is how heavy of wireing do I need to use for these type of lights ? and do I need to incorporate relays in the system ?

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Old 01-04-2014, 07:59 AM   #2
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It's the amps that govern wire sizes. Check the lights for the amp ratings. At 70 watts they should draw around 12 amps. If so, then 18 gauge wire is fine for the power circuit if you keep the wire length under 10 feet. If over 10' then use 16 gauge. I always use relays for my wiring so I don't have to have large switches in the cockpit. The trigger circuit of the relay can use very thin wire, like 18 or 20. That said, if your switch is rated higher than the amps of the two lights, you don't need a relay. Make sure you fuse it accordingly.

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Old 01-04-2014, 08:23 AM   #3
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16 gauge or below. I believe those switches can stand a higher load but its good to check if you need relays as stated above
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Old 01-04-2014, 12:22 PM   #4
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This is a handy table. I printed a copy and keep it in the garage. Scroll down for 12V.

Voltage Loss Tables for AWG Wire
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Old 01-04-2014, 11:07 PM   #5
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No one mentioned this, but you should always use STRANDED wire in automotive applications. The MORE strands the more flexible for a given AWG (gauge) wire.

Relays are ALWAYS optional if you use the correct switch for the application. Addition of a relay is just ONE MORE THING to go wrong when you need it most.
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Old 01-04-2014, 11:33 PM   #6
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Which lights are these? 12 Amps seems high for LED.

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