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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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Old 05-08-2013, 07:32 PM
NoBull NoBull is offline
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Mein Auto: 08 335 Vert, 00 540
Hardwire radardetector in 2008 335 Vert

I'm trying to hardwire my trusty old V1 into the overhead light on my new-to-me 2008 335 Convertible. I'm having trouble finding a positive wire but I don't really trust my lead finder. Did anybody do this and know which color wire to hook positive into? I'd like it to be on when the engine is on only but can deal with constant on if need be.

This is what I have to work with.



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Old 05-08-2013, 07:54 PM
NoBull NoBull is offline
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It would appear I need to use the red wire on the left : http://www.safeer.us/?p=281

I'll give that a shot.
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Old 05-16-2013, 10:18 AM
NoBull NoBull is offline
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Just an update in case somebody else is searching for this information. The instructions worked out perfectly. I used the red/brown wire on the left side which provides power only when the car is started or ignition is on. Automatic on/off.
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Old 05-16-2013, 05:22 PM
ecamp55 ecamp55 is offline
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Great DIY link, I'll be doing mine this weekend......Thanks
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Old 05-16-2013, 05:38 PM
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captainaudio captainaudio is offline
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Mein Auto: 335i E93 - 750Lix
I would add this to the installation.

Instead of having the V1 cord hang loose plug it into an RJ11 coupler (readily available at Radio Shack and the are available in black) that you attach to the top of the windshield with double sticky foam tape. Then use a 6" RJ11 cable (also available at Radio Shack) from the coupler to the V1.

With this setup when you remove the V1 there will not be a cable dangling (as you can remove the 6" cable along with the V1). Also in the event that the RJ11 plug on the 6" cable breaks (a common occurrence) you can simply replace the cable.



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