Waterfowler41

iTrader: (1)

Alright guys, I am installing an LED light bar in the lower portion of the grill on my '10 FX4 and decided that if I am going to building my own wiring harness, I might as well add space later on for some high mounted spot lights.

I know I could have bought two pre-made harnesses but where is the fun in that?

My plan is to mount two relays in a project box on the outside of my radiator support bar. The drawing attached is how I believe the wiring should go.

The big question is can both relays use the same 20A fuse to feed terminal 30 on the relays if I am not powering more than 200 watts of lighting? My gut says yes, as long as the total wattage/voltage is under the fuse rating I should be good to go but I don't know if that will cause issues with the relays especially when one will be out of service until I get management approval from my wife to buy the spot lights.

Picture below of how everything will be organized in the box once I finalize the wiring and get some time to put it all together.

Thanks guys!

Neptunescab

Personally i think you'll be fine

Spazmonkey05

Ya I can't see LED pulling more than that. The only issue I can see is that if you have a short you will lose both lights not a big deal if you don't need them to get you home

Waterfowler41

iTrader: (1)

Thanks guys and not a huge deal with shorting. All the wiring will be close by so diagnosing future issues will be easily.

RGSMDNR

Im curious to know where you plan on pulling the feed for the switches from...

Waterfowler41

iTrader: (1)

Using an add a fuse in the smart junction box to a fuse spot that is a constant hot like power seats or something. Haven't looked yet but I don't think it'll be too hard to find one.

Waterfowler41

iTrader: (1)

Well I'll just turn this into my "how I did it" thread

Had some time last night to mess with the box placement and was able to get the relays set in the box as well. Drilled a hole in the back for a bolt to mount the entire box to the frame and drilled a second hole in the bottom for wires to leave.

I was originally going to try and fit the blade fuse in the box but I don't want to cram everything in there and I figured it's probably better to get that fuse as close to the power terminal as possible so it'll mount by my stereo fuses.

Waterfowler41

iTrader: (1)

Forgot pics

RGSMDNR

I might suggest using an accessory source for the feed. Hot only when the key is on and off while cranking... Just my .02.

sigma pi

wow a lot better looking than my wiring / relay