Join Date: Jul 2002
Location: Tucson, AZ, USA
Re: All mixed up. Need Help!
It really won't matter if u use the 35 watt ballast for high beam; but might as well use it for low.
H7 is the low beam which goes right into the socket. The high beam is installed in an adapter with a plastic handle on one end, helps removing and installing it, of a plastic tube with ribs that side into slots in the socket. A metal crown or cap with flanges on it to hold the bulb in place slips onto the plastic piece.
The H4 bulb is just a bulb with a one wire tail, no flange. The crown makes contact with a skirt on the bulb making the second contact, and the plastic piece has a contact with the crown and flat stock to it's end where a spring tab contacts it and holds in the socket.
Nope, cannot solder a second wire onto the H4 bulb.
We need this adapter because of how BMW designed the high beam, inserted past the rear of the head light into the reflector.
"He was a foul caricature of himself, a man with no soul, no inner convictions, with the integrity of a hyena, and the style of a poison toad." H. S. Thompson