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I need to run new wires for my turnsignals and new led tail/brake light set up. I have 18 gauge. Is this ok or should I get a lower gauge?
 

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18 guage is fine. LED's draw less amperage then filament style bulbs. You could probably get away with a smaller size wire like a 20-22 guage.
 

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The only reason NOT to go smaller than 18 guage is the mechanical strength of the wire. with smaller sizes it is easy to abrade the insulation or just to break the wire.
 
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