Wiring dual headlights

[89Decepticon]

How am I supposed to get this harness integrated with my stock harness. I know I'm not the only one thats done this mod. so I know I am not re-inventing the wheel. I've searched and found lots of people who have used these exact lights. yes I know they are not DOT. I'll deal with that accordingly. But how do I get them to work. The halos work without the relay.....but not the lights.....any help is appreciated before I start cutting into these things. Here is a link to wiring diagram that came with the lights.

http://i1201.photobucket.com/albums/bb343/89decpticon/My%20Bike%20and%20my%20build/wiring.png

[FJCharlie]

here you go, no relay schematics http://wiki.gstwins.com/index.php?n=Upgrades.DualHeadlights
but i recomend relay if using H4 bulbs, you could use 2 HS7 bulbs, they are same as H4 just 35W/35W

[89Decepticon]

thanks FJCharlie, the set does come with two H4 bulbs, 55W each. so if i am using a relay....how does that change things?

[FJCharlie]

A relay is an electrically operated switch. The more powerful an electrical device, the more amps (current) it draws. To handle more amps you need bigger wires otherwise they get hot and melt. The same is true of switches - they are designed to handle a certain power, beyond that they get hot and melt = not what you want.
Now, you could just buy a bigger switch, but at some point that gets too big and clunky / expensive, plus you are running really big wires all over the place to keep things going.

So, a relay is a switch that is turned on or off by electricity - a small electro-magnet moves a contact inside. This is useful because the magnet uses a very small amount of electricity (usually less than 1 amp) to move the big clunky contact that can handle a BIG current (usually 30-40 amps) which is more than any reasonably sized switch.

This means you can use a small and cheap switch on your bike (what you have now), with skinny wires as all it has to do is supply 1 amp to the relay coil. Then you just need a big fat wire from the battery to the relay, and from the relay to the load (your lights, dual horns or whatever). Because you don't need to touch the relay, it can be somewhere convenient, which means you can run the fat wires more directly - saving space, and saving wire.
Basically you use it not to fry your bike switch or wires..

As you will have 2 headlights youll be having a wider spectrum of light so you wont be needing 2xH4 which will produce 120W of light, you can be satisfyed with 2xHS1, which have same 3 contacs as H4 (sorry for first post i said HS7 - my bad) which produce 70W of light, more than single H4 but wide enough, and by adding 10-15W more you wont be needing a relay...
And im not sure about you battery would handle as much power draw just for light as 2x H4= 120W (60W short, 55W long) / 12volts = 10 amps just for lights.
Good luck! 

[89Decepticon]

my mistake....I've gone thought the directions again....they have two H3 bulbs  .....55W/15 amp......does this change things? thanks for the knowledge.

[FJCharlie]

if H3 then you use one for short and one for long light (not sure you call it that way-the lights) if 55W no way they use 15amp, 55/12=4.6Amp.
so no need for relay or anything, what you do is, you have 3 wires going to your current headlight, you will take ground wire and connect to both bulbs, and youre left with 2 wires, now one is short and one is long light, so one to one bulb other one to second bulb. thats it. and have fun while doing it.
remember, pics or it didnt happen!

p.s. re thinking it, those are just for looks, what i would do, id find 2 H4 connectors and somehow install it into your dual headlights, placing 2x HS1 bulbs. that way youll have looks and kick ass light since both headlights would work in same time

[89Decepticon]

so i was just out playing with those lights. I ride an 89 and I've got a set of plugs for aux. in the nest of wires. These aux are supplied with power when the key is turned on. can i not hijack those for my low, then wire in my other one to my harness so that when i flip my high beam switch it turns on the other light. I'm no wiring genius...so this seems like something that i could pull off...more so then getting a diode in there somewhere as the wiki suggests....