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1welder 08-31-2010 04:15 PM

Wiring question
I just installed a set of lightforce lights on my truck. My bumper has two 4 1/4" holes that I want to put to good fog lights in. My question is can I splice the two new 4" lights into the two wires that I have powering my existing lightforce lights? The lightforce lights have 100 watt bulbs in them if that matters. Thanks for the help.

Trap 08-31-2010 04:20 PM

Chances are no. You could if you check the fuse and the wiring you installed to see if it can handle the increased amps. If it can yes then you can do it. The total new demand must be only 80% of wiring and fuse rated load.

Trap 08-31-2010 04:28 PM

Personally I would not do it also. I'd use the existing relay to power a second relay in parallel if you want it to all work with a single switch. Then I'd wire up the new lights with a new fused circuit sized to the new lights. It's the safe way to do it. That is a heavy demand circuit already.

vantaco 08-31-2010 04:38 PM

i'd pull the harness going to the exisiting lights and use that as the trigger for a double relay harness to run all four lights

that way there is a minimal load on the stock/existing wiring and you can use larger gauge wire in the relay harness to power the four lights

1welder 08-31-2010 05:13 PM

Man thanks for the info. Wiring is not my
Specialty! Took me two days to figure out how to do the blinker swap! I'm not totally against havin another switch. I could run another harness. Unless you all could really break down this double relay deal. Feel free to elaborate! Lol
My setup now has a switch with a in line fuse that goes to one of the headlight wires under the steering column. A wire that goes from the switch to the relay. A ground on the switch. A power wire to the relay with a 30 amp fuse. And one wire leaves the relay and splits off to each light. Just a little run down of my existing setup.

Trap 08-31-2010 06:10 PM

Oh it's easy. The existing relay coil just pigtail off of that with two wires and run it to a new relay coil. Then from the battery positive to a fuse real close by to the new relay contacts to the lights to ground. Look at that thread basic electronics for relay wire numbers so you can figure out which contacts are indeed the relay coil. Old one works the same and the new one controls the new lights using the existing switch.

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