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E36/7 Z3 (1996-2002)
E36/7 Z3 Roadster, Z3 coupe, Z3 M Roadster and Z3 M Coupe talk with our gurus here.

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  #1  
Old 09-04-2010, 07:11 AM
bobaliu bobaliu is offline
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Radar detector install in MZ4 roadster

In case anyone is interested, I posted some basic instructions for a radar detector install:
http://forums.bimmerforums.com/forum....php?t=1520790
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  #2  
Old 09-07-2010, 07:26 AM
courtier courtier is offline
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On a similar note, I'm trying to install a Homelink UGDO (Universal Garage Door Opener) in the cross member above the map lights. (from eBay ~$20 which is a lot better than ~$700 for a BMW mirror) Over the weekend, I popped out the map light assembly and confirmed there is enough room in the frame to fit the Homelink unit. I know from other posts that the purple/white wire that runs through that area is hot when the ignition is on.

So do you (or does anyone) know which wire to tap for neutral? The Homelink needs neutral not ground.

Thanks.
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  #3  
Old 09-07-2010, 03:48 PM
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jragan jragan is offline
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Quote:
Originally Posted by courtier View Post
So do you (or does anyone) know which wire to tap for neutral? The Homelink needs neutral not ground.
I could be wrong, but in DC applications, there is no neutral and it could just be that you got a hold of instructions with a bit of bad translation.
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Old 09-11-2010, 06:25 AM
SwapMag1c SwapMag1c is offline
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very very clean! this will be one that i do.. when i get a RD. haha
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  #5  
Old 09-11-2010, 08:12 AM
courtier courtier is offline
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OK, so here is a picture of the Homelink unit. It has two leads coming off. I have tested it with a 9v battery and it won't fire unless I connect one lead to the + terminal and one lead to the - terminal. Admittedly, I am not an electrical engineer but it seems to need positive and neutral.

Anyone know of a neutral wire to tap off of?
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  #6  
Old 09-11-2010, 09:22 AM
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Ron Stygar Ron Stygar is offline
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Quote:
Originally Posted by courtier View Post
OK, so here is a picture of the Homelink unit. It has two leads coming off. I have tested it with a 9v battery and it won't fire unless I connect one lead to the + terminal and one lead to the - terminal. Admittedly, I am not an electrical engineer but it seems to need positive and neutral.

Anyone know of a neutral wire to tap off of?
http://en.wikipedia.org/wiki/Ground_and_neutral
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Old 09-11-2010, 11:54 PM
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Ron's link is fine for an explanation of 'neutral'. It's an unfortunate term for the average consumer. It's also a term that's only used for AC mains wiring, not for DC wiring in a vehicle.

The correct term for DC in a vehicle is 'ground'; there is no 'neutral' separate from 'ground'. Typically any solid brown wire in a BMW.
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Old 09-12-2010, 07:28 AM
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Ron Stygar Ron Stygar is offline
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Typically any solid brown wire in a BMW.
I only found one on the Z3-M coupe sunroof switch.

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Old 09-12-2010, 09:36 AM
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dwm dwm is offline
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Quote:
Originally Posted by Ron Stygar View Post
I only found one on the Z3-M coupe sunroof switch.

Yes, as your diagram shows, sometimes the convention isn't followed and/or the wiring isn't as documented. In the Z3 M roadsters, the hot and ground wires for the dome light swap colors mid-harness (connector in the passenger side A-pillar).
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