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Because the Expedition has a separate highbeam and lowbeam bulb but the projector uses one bulb for both with a shutter for highbeam. This makes an issue that lowbeam would work fine but highbeam would not.
You would either have an issue that highbeam would activate the shutter but not the bulb. Or the highbeam would activate both, but so would low beam. Or you ignore the shutter and use the separate high beam bulb.
I used a 15SQ045 diode that i found a 20 pack on Amazon for $6. They should be rated for 15 amps each but i doubled the diodes to try and help . Not sure it was the correct thing to do but its what i did.
A simple fix would be to use a diode on the highbeam so it allows power to go to both the shuitter and the bulb, but prevents the low beam from activating the shutter
They also do sell 'bi-xenon' relay kits to do this but a diode will work just fine if you understand how to use them.
Not only did i do the diode, but i wired the separate highbeam bulb so not the projector and the high beam bulb will be activated for max brightness.
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