OK wiring guru's... need help headlight relay s4r 007+

[TAftonomos]

I'm wiring up my HID ballast and bixenon projector.  To move the bulb shield and switch from low to high, I need to apply 12V/or ground to a relay.

The bixenon projector has 4 wires to it that control the bulb/sheild.  2 apply power to the HID ballast and light the bulb.  These need to go to a switched source and come on when I turn the key on.  I'd like to keep this to a constant hot lead at all time, as killing the light to turn the starter isn't going to be good for the HID bulb or ballast.  Ideally I will switch over to a euro headlight switch and can turn the light off before starting the bike/turning on the key.  Of course, those are 150+ on ebay, and I'd rather not drop the coin on that at the moment.  Not sure what to do here.

The other 2 wires are to move the shield, but applying 12v to a solenoid. 

I've found the headlight relay on my monster.  It has 4 wires going to it.  2 are constant hot all times, one ground comes on when you turn the key, other ground comes on when you switch on the high beams.... I figure I can wire in the shield solenoid to the switched ground on high beam and a constant power?  Or will that somehow hurt it?

[Raux]

why not get a small 12v switch from radio shack and mount it somewhere before the ballast.

[TAftonomos]

I can do that for the light to avoid the turn on/off when I start it  I suppose

[Raux]

just make sure you put a fuse in line with it.