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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 11-13-2005, 07:20 PM   #1 (permalink)
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Low voltage on driving lights

I spent over a month trying different bulbs to get the best light output but I always had a problem; the light was yellowish even if I used the white bulbts etc.

Yesterday I measured the voltage (with engine running idle) and I noticed that the voltage reaching the H1 bulb was 11.2 volts only whereas the voltage reaching other electrical parts of the car was 13.5 (normal).

That loss of almost 3 volts is translated into innefficient light output and more generated heat on the wires. It seems that the problem is at the end of the wires and at the connectors, which are very dirty and rusted - copper wires became green (at the point that they need replacement).

Does anyone know where to get replacement connectors and wires for my E30 driving/high beam lights?
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Old 11-13-2005, 07:38 PM   #2 (permalink)
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you could just go buy new wire, or you could run relays. if your going to go to that much work you may as well do a conversion as well.
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Old 11-14-2005, 04:43 AM   #3 (permalink)
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Conversion to what? HID for example?
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Old 11-14-2005, 02:22 PM   #4 (permalink)
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Here's a relatively cheap one.
H4/H1 CONVERSION
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Old 11-14-2005, 03:08 PM   #5 (permalink)
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For a bit more amount of money I can get an HID conversion kit from ebay. The only thing that bothers me is that if an HID bulb will fit in the place of the H1 bulb.
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Old 11-14-2005, 04:48 PM   #6 (permalink)
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i did an H4 conversion and i couldn't be happier. 110 watt high beams and i believe it was 85 watt low beams.
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Old 11-14-2005, 05:14 PM   #7 (permalink)
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Did you change the entire wiring system? Cause 110 watts is a lot of extra Amperes for the stock wiring to handle
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Old 11-14-2005, 08:48 PM   #8 (permalink)
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i used the original wires as the switch for my relays, and ran new wires from the power block under the hood for the actual headlight power, and i ran new grounds
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Old 11-15-2005, 12:48 PM   #9 (permalink)
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hmmm sounds good to me... I'd like to keep my smileys though with the H1's so I consider changing the wiring from the fusebox (relay onwards) and using high wattage H1's
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Old 11-15-2005, 01:39 PM   #10 (permalink)
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you can still keep your smileys... i think you may haev missunderstood what i was saying, the stock wires are just so i dont have to fool arround with switches, everything works the same. but anyways yes a nice high watt H1 would do the trick. im hoping to find an off road light that will fit in there somwhere arround 250 watts...
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Old 11-15-2005, 02:44 PM   #11 (permalink)
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Lol .. thats .5 kilowatts load? You better not forget them on with the engine off.
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Old 11-15-2005, 06:33 PM   #12 (permalink)
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hahaha i know, but luckily they automaticly go off as soon as i turn the key off
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