I have 2 hella 500's on the front and I DO NOT want them to be wired in to activate with my high beams I want them on a separate switch. I have a relay with 4 prongs on it. One is for the ground, one goes to the lights, one is power, and the last one is what I ahve a question about. How do I wire up driving lights through a relay from a 3 prong switch to operate my new Hella's separately from my high beams. I am looking to have a totally separate set up so that I can turn on my driving lights when I want to via a switch on my dash. Any help is indeed appreciated. Thanks

 

Wire the last prong to a wire that is hot only when the ignition is on. That way you can't accidently leave the lights on.

 

either that, or just tap it into the main power wire, and just check to make sure you dont leave the lights on.

 

A 4 post relay has 2 sides, a switching side and a load side.

Load Side:
1pin connected to the batery +
1 pin connected to the consumer (lights)

Switch side:
1 pin signal wire comming from switch in dash
1 pin going to ground

normally (not always) the relay may have the diagram on the side of the relay case, and the connections will be numberd. Look at the actual pins, there may be numbers next to them that coorespond to the diagram. This will tell you what side is switching side and what is the load side.

Check this out.......
http://electronics.howstuffworks.com/relay.htm

Id go for a 2 prong switch to make life easier!

Good Luck

John

 

I have a simple write-up on how I installed my Hella 500s just like you are talking about. It is on my website under the write-ups section.

 

Look in the Tech section here as well.
I have info in there on how to wire up the factory Toyota switch with Hella 500 lamps.

I have mine wired up to come on at any time.

 

If i'm understanding this correctly the 3 prong switch has a power tap into the fuse panel either always hot or only hot when the key is on, and the relay is connected to the battery. Am I understanding this right: the switch has a separate power source and so does the relay?

 

That is correct.
The power source for the switch only has to be a trickle, it's what energizes the relay.

I have all three sets of my light switches tied in together, and it goes to one fused outlet on my underhood fuse box I wired in.

https://www.yotatech.com/~corey/tech...box/mod39e.jpg

 

Excellent!! As always the crew pulls through for me. Thank you again and I will send pics when I am finished.

 

 

Corey,
Where did you get that fuse block?
Thanks,
Mike

 

Mike, I got it at my local Schuck's Auto Parts store for around $10 or so.
But you can also get them from Waytek.

Mine is a 6 gang block, with no ground.

 

Thanks. That's terrific. All I ever see around here are fuse blocks that do not have a common power source, basically just fuse holders. That unit is much neater.
Thanks again.
Mike

 

Yep, that big bolt goes right to your battery with a wire, and an inline fuse of course.

All the stuff I have connected to it have their own grounds, so no need for me to have a grounding source on the unit itself.

This is really a very simple mod indeed.
More info on it can be found here.