Now that you have asked…

First off you need to decide on two or three lights.
Then the usual proactive is to wire them in pairs, so there is an odd man out here.
Do you really need the third light (?), IMHO… NO ! It will be out of place and as stated before it is a good spare.

Going on the assumption that I have talked you into two light the following will apply, you can ad the third in another relayed circuit and you can use the same switching wire but not the same relay.

150W x 2 = 300 Wt / 12V = 25 amperage draw/pr.

What you need…
1) 40 amp std automotive relay with 4-pins. there are two type of relays, a 4-pin and a 5-pin, the 5-pin has pin 87A, almost useless, if that is the only one you can find then use it and cover the extra pin with heat shrink so it doesn’t get hit accidentally.
2) Fuse and holder for 30 amp fuse
3) 10 ga wire for the main power wire
4) Sw for the dash - any sw will so, small amperage draw so it does not matter.
5) 16 pr 18 ga wire for the sw, enough to go from the fuse panel to the sw to the relay and then a small ground wire.
6) Small fuse holder and fuse for the sw power.
7) Indicator Light, you may or may not want this and some switches come wit it built in so your call.

Now wire per the schematic below:


[IMG][/IMG]


I did this How-To, not sure if it is good or not but read it and then you can tell me:

https://www.ranger-forums.com/interior-exterior-electrical-123/how-aux-light-hookup-indicator-light-105901/

 

You, sir, are the man!

 

Remember that is for two lights…

If you want to turn on three at a time, one relay, one fuse AND they are the 150W Lamps, then you need to increase the amperage level of all the components.

450W / 12 = 37.5 amps, that’s a lot of amperage to setup for but it can be done.

If you stick to two lights per relay, if something happens to either the pair or the one then you will still have some light to get home with.

luck with it.

 

I think I'll stick with the 2-light setup. Less wiring, and I'll have a spare like you mentioned before. I'll probably keep the spare in my truck in case something happens while I'm using them. Thanks for all your help Grev!

 

Ok then get it done.
Two will give you all the light you need and may look better.

Luck on the wiring, do it right the first time, you know.

Any questions I can help you with just ask.

 

I'm on break from school so I won't get a chance to fab anything up for another week and a half or so, but I'll probably go ahead and buy all the wiring stuff I need before then. Doesn't look too hard. I'll let you know how it goes.