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#1011076 - 05/11/18 01:48 AM '07 RT Low Beam?  
Joined: Nov 2013
Posts: 71
bulletbill Offline
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bulletbill  Offline
Member

Joined: Nov 2013
Posts: 71
Texas
Seems I have lost power
to the right low beam. Thought it was to bulb, but no. Pulled the plug to the complete Light unit looks like a common ground. with a test light I have power to all but one clip? So where do I start looking for the source to the plug for the right low beam??


Bulletbill
MOA, IBA, AMA, POG,CMA
#1011258 - 05/14/18 02:19 PM Re: '07 RT Low Beam? [Re: bulletbill]  
Joined: Jun 2010
Posts: 14,643
dirtrider Offline
The Oracle
dirtrider  Offline
The Oracle
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Joined: Jun 2010
Posts: 14,643
Ohio
Originally Posted by bulletbill
Seems I have lost power
to the right low beam. Thought it was to bulb, but no. Pulled the plug to the complete Light unit looks like a common ground. with a test light I have power to all but one clip? So where do I start looking for the source to the plug for the right low beam??


Morning bulletbill

Yes, common ground to both low beam bulbs (brown wire).

12v side has a separate power into each low beam bulb. one side is (yellow) other side is (yellow/white).

Usual cause of one bulb failure is the bulb itself. (sometimes the H-7 bulb won't work in the bike but will test good remotely). The headlights in the BMW 1200RT are computer controlled so if the computer sees a high current into the bulb it will shut that circuit down. Testing remotely will still light the bulb but the computer might not like the low resistance (like a shorted filament).

Other problems are the bike side terminals at the bulb burnt brown or black causing high resistance & bulb failure to work.


D.R. ___
Sent from my rotory dial wall phone!
#1011384 - 05/16/18 03:54 AM Re: '07 RT Low Beam? [Re: bulletbill]  
Joined: Nov 2013
Posts: 71
bulletbill Offline
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bulletbill  Offline
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Joined: Nov 2013
Posts: 71
Texas
dirtrider, Thanks for the reply, this happen as I was leaving on a Road trip, will be back next week to continue checking, we changed the bulb and discovered that it didn't fix.


Bulletbill
MOA, IBA, AMA, POG,CMA
#1011397 - 05/16/18 12:00 PM Re: '07 RT Low Beam? [Re: bulletbill]  
Joined: Jun 2010
Posts: 14,643
dirtrider Offline
The Oracle
dirtrider  Offline
The Oracle
Member

Joined: Jun 2010
Posts: 14,643
Ohio
Originally Posted by bulletbill
dirtrider, Thanks for the reply, this happen as I was leaving on a Road trip, will be back next week to continue checking, we changed the bulb and discovered that it didn't fix.


Morning bulletbill

Was the new bulb verified good (maybe a defective bulb)? Did it come on at all? Certain H-7 bulb types you can't touch the glass part of the bulb with your fingers or the bulb could crack shortly after first lighting.

Is something tied into the 12v power going to the headlight side that is out?

Some use one of the headlight power wires to trigger an underseat fuse box or relay for other accessories. If that is the case & that circuit is shorted to ground then the computer can shut that side headlight off.


D.R. ___
Sent from my rotory dial wall phone!

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