LED light bar wiring help

[huntandjeep]

So I got a 20" bar for my truck that came with its own harness / relay / fuse and switch. My F350 came prewired with 4  switches , they all have relays and fuses. I want to use the Ford switches to operate the light. Doing that has me stumped. The light has 3 wires coming from it Blue, White and black they run into the relay and then to the aftermarket switch. At the relay is the battery hookup for the light harness.
 What I'm thinking of doing is cut the aftermarket harness @ the fuse/ relay , leaving me with 8' of wire from the light ( Blue , White and Black ). I'm assuming the Black is ground. Of the Blue and White wires  left only 1 will be needed to pass into the cab to the hook to the Ford switch . Now the question is which one and what is the other wire for ?
 Thanks Allen

[jackelope]

Forgot about it.  Sorry!

14a303  is the harness you want for switch #1 I believe.

[huntandjeep]

Forgot about it.  Sorry!

14a303  is the harness you want for switch #1 I believe.

Totally understandable appreciate the help . After I PM'd you last night I was able to find the wire under the dash that I need. But only 1 wire hooks to it. My aftermarket harness has 3

[hunter399]

One wire to a main power source ,then the other to your switch,and ground,But I really can't tell ya ,cause some light bars have a hi flood light , then a low beam,so I'm not exactly sure the type of light bar you got.Light should of came with instructions , or Google ,wish I could help more,my light bar had two wires , with a hi/lo beam option.since I hooked to batery with a switch in the cab it's full power hi/lo beam at the same time extra bright.

[Ridgeratt]

what would happen if you just went straight to the battery and found out what the 3 wires did. One is going to be ground and then just touch the other 2.   

[hunter399]

what would happen if you just went straight to the battery and found out what the 3 wires did. One is going to be ground and then just touch the other 2.   

Cause you may never know till ya do.

[hunter399]

The relay may have something to do with hi/lo option,I just put a inline fuse on the wire coming off the battery to my swich that way if the light malfunction, or switch goes bad or anything I can pull the fuse to kill power to setup , and to make sure the light not drawing to much power.

[Jolten]

If I remember correctly... And it's been awhile.

Black - ground
White - high beam
Blue - neutral/low beam if you want the light bar always on.

[Ridgeratt]

If my feeble memory serves me I think that there is something about not being able to run the truck Hi-beams and the led running lights both. I know that's what had to be done on my old truck.
But the Led's shouldn't draw hardly anything. if you just touch the wire ends to the top of the battery it should show you what they do. Just shine them on the door or the wall and not look right into them.   

[huntandjeep]

Ok you guys are losing me on the hi/ low beam. There is no Hi/low option with this light. The switch that came with the light is just an on/off.
Ridgeratt that's what I will try tomorrow .

[Ridgeratt]

Ok so try this.
The switch just will power the relay to turn them on in a aftermarket set up and then the other 2 wires feed to the light circuits. depending on if you have a fog setting and then a running light. Perhaps the low setting is a constant on until you turn them Hi side on.

That's all I got.   

Looks like this is a remote switch to operate the lights but there it is.

[Russ McDonald]

Pretty sure you guys are right.   I bet the relay is they're for when you go high beam on your factory light out will turn the led light bar off

Sent from my SM-N950U using Tapatalk

[Ridgeratt]

I believe there is an RCW. stating you can only have a total of 4 lights in use for Hi-way driving. That's why they used to sell lights with covers.

[hunter399]

I can have mine on with high beam / low beam headlights,i can turn my headlights off and run just light bar,with my dirrect wire setup,but I can't run it with other cars on the road way to bright.

[CAMPMEAT]

Wire separately so you have no issues. Use the on/off switch supplied and make your life easy. Don't ask me how to do it, because I always had someone who knows what they are doing.