[Acetechno]

Your diagram is almost right. Prongs 85 and 86 is the "trigger" side of the relay. This is where your SPST rocker switch needs 12Vdc comming into it on the center pin of the switch. the left side is OK to ground if it has a light in it. If it does not have a light in it, it would then be a SPDT switch and then you would hook the center and only one other side up. In your diagram relay 30 is correct and the voltage going out of the relay sould be on prong 87 which is correct also. Do not ground the relays prong 87a. It will short things out and cause the battery to drain if the wires dont melt first. Prongs 30 to 87a are the NC (normaly closed) side of the relay. Hooking this side up is the same if there is no relay in the circuit at all and makes no diffrence (always passes current to the load. prongs 30 to 87 is the NO (normaly open side. this is the side that gets switched when 12Vdc is sent to prongs 85 and/or 86.

So here is how I would wire things. run wire from the B+ on the battery to prong 30 with a 10awg or larger wire. Prong 87 to lights + post and other side of lights to ground. Prong 87a not used. Tap splice off the cigaret lighter wire or other ignition 12 volt source that works only when the FJ is powered on and running to your switch center pin if that is not labled ground, From the right prong on the switch, then wire to prong 86 on the relay. Ground relay prong 85 to metal. A relay needs 2 diffrent 12Volt sources to work. A relay is used to switch power to two diffrent sources or used to power a source on/off when a SPST switchs current rating is less than the amp rating of the load. All your are really missing is the 12v 2nd source to go into the center prong on the rocker switch. Good luck.

 

[Acetechno]

 

[Acetechno]

the switches need power to work.

Like this.

You can also put a fuse inline to the fuses it you like.

This is correct. And is one of 2 ways to do it. The only draw back of doing it this way is if your truck is off key out and you forget to switch off the rocker switches your lights will remain on. Just remember to power everything off and you should be fine. Thanks Josh for drawing this out.

 

[Acetechno]

I would run 8awg from my battery to my fuse block/holder. Run 10awg to my lights and also to my compressor. I would use 18 or 16awg to my switches. They will not pull any current per-say. Use the same gage for grounding also. Use 30 or 40 amp relays I would also use a inline fuse at the battery + post and as close to it as you can. Like the one used for a car stereo amp. 50 amp fuse would be fine. 8awg is rated to 50 amps. So is 10awg at 20 feet, which should be enough length to get to the rear of your rig. Good luck. That figure of [email protected] = 4.5 amps seems really high if that is per light for current draw. in a house a 100w light bulb only draws about 1Ahr. But who knows, I'm not a 12v guru.