Projector/HID Custom headlights

First let me say that I did a search and read several posts. I have some ideas but would like second opinions.
I had the dual filament H4 bulbs (three wire hookup -> high, low & ground). I recently converted to a custom bixenon projector setup. (four wire install 12+ to ballast, ground to ballast, 12volt to high beam magnetized switch in projector [this is a magnet that engages when 12volts applied and pulls down a thin metal bar to make the headlights appear brighter], & ground to the high beam magnetized switch in projector.) Initial wiring: 12+ wire of ballast to low beam wire of OEM harness, both grounds to ground wire of OEM harness, and the high beam magnetic switch wire high beam wire of OEM harness. My lows work fine and I am able to flash my lights when the headlights are off.
My problem is that when I hit the high beams the low beams cut off. I need the low beams to still get power when I turn on the high beams.

First question: I wanted to use two diodes on for each headlight assembly (jump highs to lows using a diode and using another diode just before the jump on the lows to prevent feedback. Do they make a diodes that I could use to do this rated @ approx. 12volts/30amps?

I have the similar problem in the post below.
THis post was of interest and I believe I can make it work:
https://www.the12volt.com/installbay/forum_posts.asp?tid=36167&PN=1
Second Question: If I use that relay, would that work for my setup?

Third Question: Where can I purchase that relay?

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LEDs

A D620 is rated for 200 volts, and can sustain prolonged operating current of 6 amperes. They can be readily had for the average consumer at any on-line electronics store.

They cost $0.90 for two at www.allelectronics.com

The larger current rated diodes you speak of, are also made but are used for industrial applications. Personally I have never seen a diode rated for 30 amperes that didnt cost more than $45.00.

But shop around, and you might be surprised.

Regards

EVIL Teken . . .

Thanks,
I will measure the current draw from the projector bulb to see if that would be satisfactory. I think the factory fuses for each high and low beam are 10amps.
Hopefully this projector ballast and bulb draws less current than that. Therefore I could possibly use the D620

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LEDs

Just in case that particular model diode is not in stock you may use the other rated 6 amp units. The only difference in them is their respective higher working voltage rating.

D660 = 600 volts @ 6 amperes

P600M = 1000 volts @ 6 amperes

Regards

EVIL Teken . . .