Go Back   Horizons Unlimited - The HUBB > Technical, Bike forums > BMW Tech

BMW Tech BMW Tech Forum - For Questions specific and of interest to BMW riders only. Questions comparing which bike is best etc go in the "Which Bike" forum.
Contact Overland Solutions for all your custom modifications and setup for overland travel.

Parts & accessories for adventure touring motorcycles including GPS mounts, panniers, luggage, protection, dry bags, camping gear, tools, books & DVDs.

LinkBack Thread Tools Display Modes
Old 8 Aug 2012
Scrabblebiker's Avatar
Contributing Member
Veteran HUBBer
Join Date: Jun 2007
Location: Victoria, BC, Canada
Posts: 222
2007 F650GS (Single) Keeps Blowing Fuse

I'm not sure where to start looking for this problem. I hope someone here has some hints and tips to get me started.

The bike was working fine. I was riding at about 125km/h when the tachometer and speedometer suddenly dropped to zero. The bike kept running but there were no lights in the dash and no turn signals. The headlight and tail light both still worked, as did the starter and horn.

I found a blown 7.5A fuse and replaced it and everything came back up. I left the bike for 30 minutes and turned the ignition switch to on when I returned. I noticed no lights in the dash and tested the turn signals. They weren't working again. I had not started the bike yet, just turned the key to on. Not wanting to waste another fuse and having a ferry to catch I drove home with no other problems aside from some nervous moments around police cars, not knowing how fast I was going :-)

Any ideas where I might start looking? I can only assume that something is shorting out since the fuse blew without the bike even running. Also, I found that the brake light was constantly on. Am I wrong in assuming that this shouldn't have anything to do with the fuse blowing? ...it's on a different circuit and that fuse was intact.

Thanks for any help.

Reply With Quote
Old 11 Aug 2012
Registered Users
Veteran HUBBer
Join Date: Mar 2007
Location: UK
Posts: 3,417
I would hazard a guess that you are not wrong; the brake light constantly on may be caused by a sticky switch - one of the two for the front and back.

As for your fuze problem, your description of the symptoms points toward the ignition circuit (before pressing the start button) including whatever else is on that fuze (you don't say if you have a wiring diagram).
Could there be a short in the ignition circuit??

I hope this helps - you seem to have a methodical thought process to date
Reply With Quote
Old 11 Aug 2012
Registered Users
Veteran HUBBer
Join Date: Apr 2006
Location: Up in the hills of Norfolk
Posts: 254
I had a very similar problem with my 2002 F650GS single.
Mine was caused by a broken wire up near the bars.
Can't tell you which one I'm afraid as took it to a man who knew what he was doing.
Good luck.
Reply With Quote
Old 12 Aug 2012
Moderated Users
Veteran HUBBer
Join Date: Apr 2008
Posts: 502
Get a wiring diagram and check the circuit protected by that 7.5A fuse; doubt it is the ignition circuit or the bike would not run.

The fuse can blow as soon as the ignition is switched on so doubt it blew while the bike was off - I suspect all the fused circuits are switched power i.e. only on when the ignition is on - except for the main fuse which will be bigger than 7.5A.

Usual locations are places where the loom rests against part of the frame and rubs through. You can use a multimeter to check approximately where the short is by checking resistance between various connectors/components and ground (will be zero if there is a short in that part of the circuit), although you can often see where the short is with a thoughtful search of the loom.

The circuit to check is the instrument light-indicator circuit which is switched. You are correct that the brake light being constantly on will not be connected to this problem as otherwise the fuse for that circuit would also be blown.
Reply With Quote
Old 13 Aug 2012
Scrabblebiker's Avatar
Contributing Member
Veteran HUBBer
Join Date: Jun 2007
Location: Victoria, BC, Canada
Posts: 222
Thanks for all the replies. I have since found the problem and fixed it.

First of all, the brake light was NOT on all the time. The tail light was just brighter than I remember it being and the brake light was simply not working at all due to a blown filament in the tail light bulb.

Upon replacing the bulb, the brake light still didn't work. That's when I discovered that the wires going to the rear brake pedal light switch had come loose from the clips on the frame and had gotten caught in the chain at some point. One of the two wires was ripped apart. I spliced the wire with a little handy dandy splicing tube and taped it all up with electrician's tape. Lo and behold, the brake light was working again. It's now been 3 days and the fuse hasn't blown again.

I can only guess that the short from the wire ripping caused the filament to blow. Even though it's a completely different circuit it seems that maybe the torn wire was shorting against the frame and causing the other problem? All I can say is that after fixing the wire I'm no longer blowing the fuse for the turn signals and dash lights.

Reply With Quote
Old 13 Aug 2012
Registered Users
Veteran HUBBer
Join Date: Mar 2007
Location: UK
Posts: 3,417
Alls well that ends well

Sounds like a happy ending and thanks for reporting back and providing the final piece of the puzzle - funny stuff that electricity, but the connections and broken wires can play tricks and cause strange symptoms.
Bulbs are a bit like fuzes; very thin wires in the circuit.

"doubt it is the ignition circuit or the bike would not run" - Yea, I wasn't thinking too straight there!
Reply With Quote
Old 28 Sep 2012
Registered Users
HUBB regular
Join Date: Jan 2011
Location: Manchester
Posts: 40
Check your indicators

Good to hear you found your solution.

While on the subject we had the same problem with the same fuse and loss of power to the dashboard/speedo/rev counter.

As it turned out, a connection had come loose within one of the indicators and was shorting itself against the case / bulb.

This happened soon after we had taken the side panels off to check the battery and airbox and in removing the indicator we obviously loosened the connection which subsequently shorted the fuse se as soon as the bike started up.

. . thats my 2 pence worth, time for a .

Chris & Chloe
BUENOS AIRES to VANCOUVER | Chris, Chloe & two motorbikes across South, Central & North America
Reply With Quote
Old 15 Apr 2013
Registered Users
New on the HUBB
Join Date: Apr 2013
Location: Bishop
Posts: 1
2005 F650GS blows same 7.5 amp mini fuse

New to this site. Found this thread while troubleshooting. Thanks for posting.

A bunch of things happened at once. My Touratech chain guard was torn off the bike, chewed up by the chain and chucked. Then the battery died. Then the 7.5 amp mini fuse kept blowing after putting in new battery. We changed back to a 2013 BMW G650GS plastic chain guard, a perfect match for the F650GS and the best solution at about $25. The other option was modifying the original chain guard by removing the mud flap and cutting the chain guard. Sadly, not very happy with the Touratech after a rock clipped it and broke a link on my chain while I was on the Dalton Hwy. in 2008.

When it first happened, after the battery install, the dash instruments died, turn signals and brake light. The headlamp and tail light worked. We found your post and went back through, checking the chain for potential wiring snags and the turn signals. The hot lead had come off on the right turn signal and was shorting out against the ground lead. We'll see what happens tomorrow on the test ride.
Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 Registered Users and/or Members and 1 guests)
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
WANTED Givi PL188 pannier frames f650gs single Gary117 TRAVEL Equipment for Sale / Wanted 0 29 Jan 2012 15:44


NEW! HU 2015 Motorcycle Adventure Travel Calendar is now available! Get your copy now for some terrific travel inspiration!

HUGE, 11.5 x 16.5 inches, beautifully printed in Germany on top quality stock! Photos are the winning images from over 600 entries in the 9th Annual HU Photo Contest!

Horizons Unlimited 2015 Motorcycle Adventure Travel Calendar.

"The calendar is magnificent!"

"I just wanted to say how much I'm loving the new, larger calendar!"

We share the profit with the winning photographers. YOU could be in the HU Calendar too - enter here!

Next HU Eventscalendar

See all events


Latvia to Australia, an inspirational 5 month journey full of unexpected adventures!

Renedian Adventures

Renedian Adventures

What others say about HU...

"I just wanted to say thanks for doing this and sharing so much with the rest of us." Dave, USA

"Your website is a mecca of valuable information and the DVD series is informative, entertaining, and inspiring! The new look of the website is very impressive, updated and catchy. Thank you so very much!" Jennifer, Canada

"...Great site. Keep up the good work." Murray and Carmen, Australia

"We just finished a 7 month 22,000+ mile scouting trip from Alaska to the bottom of Chile and I can't tell you how many times we referred to your site for help. From how to adjust your valves, to where to stay in the back country of Peru. Horizons Unlimited was a key player in our success. Motorcycle enthusiasts from around the world are in debt to your services." Alaska Riders

contest pic

10th Annual HU Travellers Photo Contest is on now! This is an opportunity for YOU to show us your best photos and win prizes!

NEW! HU 2014 Adventure Travel T-shirts! are now available in several colors! Be the first kid on your block to have them! New lower prices on synths!

HU 2014 T-shirts now in!

Check out the new Gildan Performance cotton-feel t-shirt - 100% poly, feels like soft cotton!

What turns you on to motorcycle travel?

Global Rescue, WORLDwide evacuation services for EVERYONE

Global Rescue is the premier provider of medical, security and evacuation services worldwide and is the only company that will come to you, wherever you are, and evacuate you to your home hospital of choice. Additionally, Global Rescue places no restrictions on country of citizenship - all nationalities are eligible to sign-up!

New to Horizons Unlimited?

New to motorcycle travelling? New to the HU site? Confused? Too many options? It's really very simple - just 4 easy steps!

Horizons Unlimited was founded in 1997 by Grant and Susan Johnson following their journey around the world on a BMW R80 G/S motorcycle.

Susan and Grant Johnson Read more about Grant & Susan's story

Membership - help keep us going!

Horizons Unlimited is not a big multi-national company, just two people who love motorcycle travel and have grown what started as a hobby in 1997 into a full time job (usually 8-10 hours per day and 7 days a week) and a labour of love. To keep it going and a roof over our heads, we run events (22 this year!); we sell inspirational and informative DVDs; we have a few selected advertisers; and we make a small amount from memberships.

You don't have to be a Member to come to an HU meeting, access the website, the HUBB or to receive the e-zine. What you get for your membership contribution is our sincere gratitude, good karma and knowing that you're helping to keep the motorcycle travel dream alive. Contributing Members and Gold Members do get additional features on the HUBB. Here's a list of all the Member benefits on the HUBB.

Books & DVDs


All the best travel books and videos listed and often reviewed on HU's famous Books page. Check it out and get great travel books from all over the world.

Motorcycle Express for shipping and insurance!

Motorcycle Express

MC Air Shipping, (uncrated) USA / Canada / Europe and other areas. Be sure to say "Horizons Unlimited" to get your $25 discount on Shipping!
Insurance - see: For foreigners traveling in US and Canada and for Americans and Canadians traveling in other countries, then mail it to MC Express and get your HU $15 discount!

All times are GMT +1. The time now is 02:34.