Blown headlight fuse...05 LT - BMW Luxury Touring Community
 
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post #1 of 12 Old Jul 29th, 2012, 11:35 am Thread Starter
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Blown headlight fuse...05 LT

My LT keeps blowing the headlight fuse. Stepped up from a 7.5 to 10 amp, didn't help.
Read on another site that the headlight wiring on these bikes is too small.
Replaced the headlight bulb not too long before this started.
Blows it going down the road. Then I have to run on the high beam.
Help...
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post #2 of 12 Old Jul 29th, 2012, 12:05 pm
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Re: Blown headlight fuse...05 LT

I'm not familiar with the headlight system starting with 05. I looked up the headlights on line at MAZ BMW. I see that you have a seperate low beam.

In the past, people have had problems with the brown wire that grounds the light. I seem to remember people running a seperate ground for the light that solved their problem.

But, I cannot think of any reason that less than solid ground connection would draw more current? Perhapse the resistance increases through the problem contact?

Just running a temporary ground wire should show is the fuse stops blowing or not.

I'd have to look at the schematic to see if anything else is on the circuit for the fuse that keeps blowing?

In the future consider that changing a fuse to a higher current might be risky? I do not know if the increased risk involves damaging the wiring? If it does, fixing and replacing wires in a wiring harness is a PITA; especially if you aren't around home.

Best from tucson
Bob

"He was a foul caricature of himself, a man with no soul, no inner convictions, with the integrity of a hyena, and the style of a poison toad." H. S. Thompson
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post #3 of 12 Old Jul 29th, 2012, 12:44 pm
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Re: Blown headlight fuse...05 LT

Quote:
Originally Posted by cnhudson
My LT keeps blowing the headlight fuse. Stepped up from a 7.5 to 10 amp, didn't help.
Read on another site that the headlight wiring on these bikes is too small.
Replaced the headlight bulb not too long before this started.
Blows it going down the road. Then I have to run on the high beam.
Help...
The magic line is: "Replaced the headlight bulb not too long before this started. "

Was the bulb a direct replacement? Did it draw the same wattage? Double check these items and correct any faults. It could also be an intermittent short in the wiring caused by wires not being in their original position and touching a ground somewhere that it is not supposed to.

Put the original size fuse back in as soon as possible before melting the wiring and find the actual problem. I have a 2000 model and installed the HID system. It draws only 4.5 amps according to the manufacturer.

Robert

They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.
Benjamin Franklin (1706 - 1790)


2000 K1200LT "Latifah"
1994 R1100RSL (wife's)
1981 R80GS
1976 R90S
1965 R80/2 Frankenbike (wife's)
2001 Bunkhouse LX (given to son)
2011 Bunkhouse Queen

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post #4 of 12 Old Jul 29th, 2012, 3:10 pm Thread Starter
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Re: Blown headlight fuse...05 LT

The headlight bulb was a direct replacement. I'm going to check the ground wire and ohm the wiring. It didn't start blowing the headlight fuse for a week or two after I'd replaced the bulb. You're the second person that I've seen mention the ground wire and apparently the headlight wires should be larger gauge wires, which is do-able. I've been a mechanic many years and electrical isn't my specialty. Thanks for your help. C.
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post #5 of 12 Old Jul 29th, 2012, 3:10 pm
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Re: Blown headlight fuse...05 LT

Take a good look at the ground wire (Brown) and make sur ethe connection is tight. Then look for rubbing wires. May have pinched one when you put the headlight back cover on.

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
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But lack DE, MA, RI and CT with the 2005 LT

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post #6 of 12 Old Jul 29th, 2012, 4:44 pm
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Re: Blown headlight fuse...05 LT

Quote:
Originally Posted by jzeiler
Then look for rubbing wires. May have pinched one when you put the headlight back cover on.
I would think that rubbing wires is your issue. A loose/bad ground would cause a heating issue and might melt something and cause a short but more likely something is rubbing.

John Baker

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post #7 of 12 Old Jul 29th, 2012, 5:33 pm
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Re: Blown headlight fuse...05 LT

I worked on a bike not to long ago that when the owner replaced the bulb he pinched the positive wire. It didn't blow a fuse but you could smell it.

Dave Selvig
2004 Black LT
2000 Canon Red LT



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post #8 of 12 Old Jul 29th, 2012, 6:15 pm Thread Starter
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Re: Blown headlight fuse...05 LT

Anyone have any idea where the brown wire grounds? Is in in front near the small computer or under the back seat?
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post #9 of 12 Old Jul 29th, 2012, 10:10 pm
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Re: Blown headlight fuse...05 LT

All the brown wires make thier way back (through several tie points) to the battery negative. BMW does not use the frame for a ground (but a brown wire does tie into the transmission).

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #10 of 12 Old Jul 29th, 2012, 11:36 pm
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Re: Blown headlight fuse...05 LT

1. Change back to original fuse as others have said. Not a good idea try to fix electric problems with bigger fuses...
2. I have had TWICE malfunctioning bulb which has cause fuse blowing (only every now and then). So I really would do immediate scan on the wires and if nothing comes up, would try another bulb before starting to rebuild/-wire anything.

Born to be wild so why not

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post #11 of 12 Old Jul 31st, 2012, 9:32 pm Thread Starter
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Re: Blown headlight fuse...05 LT

Had a spare bulb I bought when it blew the fuse the first time. Changed it out last night and it appears that was the issue. Never thot a different bulb could draw enough juice to pop the fuse. Drove it last night & today and no problem as yet.
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post #12 of 12 Old Aug 1st, 2012, 2:56 am
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Re: Blown headlight fuse...05 LT

Good news

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