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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 12-17-2003, 01:11 PM   #1 (permalink)
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I just found a pair of h4 conversion head lights. Since i have halo's in my low beams, i was wondering if it is possible to swap them over and use them as high beams? So basically the low beams i have now will be plugged in the high beam, and the low beams will be using h4's. Is that possible? i know the high beams have 3 prongs instead of 2 but can i cutt if off? or do something with it?
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Old 12-17-2003, 01:37 PM   #2 (permalink)
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You'll need to find out which one powers the high beam and then just hook that one up. It should work as far as I know.
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Old 12-17-2003, 02:01 PM   #3 (permalink)
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On an E21 like my car you don't have to do anything. The only difference is that only the high beam will work in the H4 bulb. You may be lucky and it could be the same for your car.
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Old 12-18-2003, 02:35 AM   #4 (permalink)
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Wiring aside, on the e30 the low baem metal basket that the headlight fits into is not identical to the high beam. there are indentions on the basket that knobs on the headlight engage to keep the bulb from spinning in the housing. You would need a donor headlight assembly to scavange parts from, basket, springs, adjusters, etc.. It may seem like alot of work now but could you remove the halo's from the lows and transfer them to the high beams? It might be better than chopping up the harness, and you would maintain a high beam not just a light.
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Old 12-18-2003, 04:23 AM   #5 (permalink)
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wait the high beams use different housings? i don't feel like cracking my high beams apart. Can i just use my dremel and cut little niches surrounding the head light inorder for it to fit. As for the harness, i can just bend the top prong out of the way and it will fit. The two prongs on the bottom are for ground and high beam, the top prong is for low beams. So harness is not a problem. cracking the high beams and removing my halo's might be a pain in the ass. I don't feel like doing it again. ARG!
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Old 12-18-2003, 04:24 AM   #6 (permalink)
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ohh yea, what metal bracket are you talking about? the one that goes over the head light to keep it in place? The back is a black plastic basket.
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Old 12-18-2003, 04:36 AM   #7 (permalink)
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On my old '84 318i, from the outside in, there was the black plastic grill, then the trim ring that holds the bulb in, the trim ring had 3 screws that screwed into a metal basket that went around the back of the bulb with a hole in the center for the prongs from the bulb to come through. This metal basket was held in a larger metal bracket, that also held the low beam, by springs.this larger metal bracket assembly was attached to the radiatior panel by bolts. You may be able to modify the basket with a dremel if you so desire. It looks like your car is newer than an '84 and they may have changed the design of the headlight assembly I am not sure.
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Old 12-18-2003, 07:51 PM   #8 (permalink)
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wow that sounds confusing. All i know is there's a metal trim screwing on the to the bracket behind the head lights.
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