I bought a '91 CRX with aftermarket projector headlamps already installed. The "halo" portion of the lamps were never hooked up though. The low beam/high beam portions are already hooked up and work fine.

Here's how I hooked up the halos:

I'm not sure on the legal issues for halos in my state so I wanted them routed through a switch. Each halo (there's 2, not 4) has a red and a black wire coming from it. I tied the two red together and routed that wire back to an LED switch. I then spliced into my passenger side parking light (the parking light has two reds and one black with both reds reading 12V when the lamps are on) and also ran that back to the switch. The third leg on the switch is ground which I ran to a ground screw under the dash. I took the two black wires from the halos, tied them together, and grounded them to the body.

When I turned on the switch, the switch lit up (so far so good) but the halos didn't light up properly. If you look close at the halo, you can see each one has two very small LEDs. Only one of the four lit up!

I don't know if I hooked something up wrong or if the LEDs are bad. Should I have used a resistor for them? I don't know if the LEDs are for a 12V system or not. I can't imagine an aftermarket lamp assembly that you would have to add components to just to make them work!

The brand name on the projectors is Sonar.

Has anybody hooked these up successfuly?

Also, I'm not sure if this is correct or not, but the way the headlights are hooked up, the low beams are the innermost and the high beams are towards the outside.?