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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 10-17-2008, 03:48 PM   #1
owen_mc
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DIY: HID Capacitor Mod

Hi all...

Ref: E46 325Ci sport convertible 2002

In a recent post I discovered I had to make a modification to the wiring loom to get an after market Xenon head light kit working. This problem caused the lights to fail or flicker only when the engine was running. With the great help I made the modifcations and took some photos on the way:
This is what we are trying to achieve:



1. You will have a plug with a grey end which plugs into your orginal headlight, this has 2 wires coming off of it which are brown (earth) yellow (live). You need to expose the wire by cutting back some of the insulated plastic coating, like so:




2. You shall then have to solder 2 short pieces of wire from each of these exposed areas of wire:




3. These will need to be connected too the capacitor, I have used a screw type ficing here as i felt that if I need to replace the capacitor, this will allow me to do so stress free. Please note that minus to minus and plu to plus on the capacitor!



4. You should have something that looks like this:



Mines abit messy in the pictures, in order to show what I did. I have now taped all away and hidden. The lights now work perfectly.

The capacitors are on maplin website, Code VH57M is the one (PC Elect 4700uF 16v - 61p each):

http://www.maplin.co.uk/Module.aspx?ModuleNo=13472
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Old 10-17-2008, 04:08 PM   #2
SL Blak Soldier
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nice diy.

Do the hids stay on for a tiny bit longer after you turn them off?
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Old 10-17-2008, 04:26 PM   #3
owen_mc
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Nope... but if you flash the head lights before you get out the stay on for like 30 seconds anyway!
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Old 12-12-2008, 09:28 PM   #4
ThunderRobo
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What was the specs of the capacitor you used?
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Old 12-17-2008, 01:58 PM   #5
sdbimmer
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Don't forget that these capacitor has polarity. If you look at the picture, there is an arrow. If memory serves me, the arrow lead is suppose to point ot the negative (Brown) wire. If you do it the other way around, it will overheat and blow out the capacitor.

http://www.radioshack.com/product/in...ductId=2102508

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Old 01-16-2009, 12:27 PM   #6
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This will help with my cousin's install... thanks!
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Old 02-25-2009, 05:23 AM   #7
Wezza
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Mine has the same problem! Cheers for the info.
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Old 06-28-2009, 09:51 AM   #8
Gobanna
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Thank You !

I never had the flicker or any other on or off issues regarding 35W, I only had the bulb out error when I upgraded to 55W (once lights were on the bulb out error disappears).

I used the capacitors you recommended and followed the project install at :

http://www.argyrides.eu/bmw/mods/bi-.../xenon_lcm.htm

(wanted it to be as tidy as possible)

What you need:

1. 2 x 4700uF Capacitors at 16v (one for each headlight)
2. 2 x Small project boxes to fit capacitors in (A must for stock install, nice and tidy)

Everything is fine with no bulb out error ! Thanks !!!

Last edited by Gobanna; 06-28-2009 at 02:49 PM.
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Old 10-22-2009, 12:59 PM   #9
manilaboy1vic
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some are using 16v and others 35v, whats the deal?
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Old 12-15-2009, 12:42 PM   #10
thadon1883
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Quote:
Originally Posted by manilaboy1vic View Post
some are using 16v and others 35v, whats the deal?
seriously....i need to do this mod this weekend, which capacitor should i get the 16V or the 35V??
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Old 12-15-2009, 12:49 PM   #11
sdbimmer
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your battery and alternator voltage doesn't even go up that high, so it shouldn't even matter. But the 35v 4700uF is fine...

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Old 01-21-2010, 05:15 PM   #12
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sweet
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Old 07-24-2012, 05:00 AM   #13
Toxx
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Does anyone know where I can get any of these capacitors? RadioShack is sold out and I need my headlights to work..
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Old 07-24-2012, 11:36 AM   #14
sdbimmer
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cap

Quote:
Originally Posted by Toxx View Post
Does anyone know where I can get any of these capacitors? RadioShack is sold out and I need my headlights to work..
Did you try different location in your area?
http://www.radioshack.com/product/in...ductId=2102508

Is there a Fry's Electronics in your area? they have some too.
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Old 07-26-2012, 03:18 AM   #15
Wofy
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As for the capasitor voltage, 16v should work but i would put a 35v as the normal working voltage of the car is 13,8v but seems that it is not a perfect electronic circuit it may have peaks that go over 16v, a few peaks will not damage the cap but if you have a older BMW this might cause the cap to blow in a bit of time. 35V caps are just a little bit bigger but much better in this case i would say, plus if you find gold lined caps they are even better because they resist better to heat. I would recomend this one:

http://it.rs-online.com/web/p/elettrolitici/7328254/

It has a 105c 221f working temp
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