Originally Posted by k15goose

Mine seem to be constant voltage to bulb and a small DC motor moves bulb back and forward, ie like a window motor... no signal, no movement.

Can anyone confirm?

Originally Posted by lewis26

that's how all bi-xenon hid's work. Bulb is always on, and a solenoid controls the cutoff shield.

The bulb does not move. Only the shield retracts for high beam functionality.

Originally Posted by Reatki

The wire powering the solenoid is the one you tie the relay to..

Originally Posted by 051F

For the people that are not sure how the lights work, here is a good video that talks about the flaws of the factory HID's. This is from another forum member, he does not really say anything about solenoids but a solenoid is what holds the cutoff shield open when high beams are energized.

2013 F150 OEM HID Projector Flaws - YouTube

Originally Posted by 051F

When pin 86 gets power it energizes a coil that causes the switch to close and pass power from 30 to 87 and this is what causes the light to power. The power for the dually's comes from the battery, pin 86 just gets power from the trigger wire, which in this case is the the wire that operates the solenoid that pulls the cutoff shield out of the way for the bright lights. It does not take much juice to operate the coil that closes the switch from 30 to 87. So as already stated by another poster it does not matter what that wire controls as long as it provides enough voltage to the coil between 86 and 85 to close the switch between 30 and 87.

**edit** Reatki, nice easy diagram for someone to follow!

Originally Posted by GVHunt

Thanks for the detailed explaination, I'm not very experienced in relays so this helps alot. Any idea what the color of the wire is on my 2010 f150 for the high beams?