Mon May 06, 2019 10:03 am

Enthusiast
2008 MP3 400
Joined: 16 Aug 2008
Posts: 93
Location: Glen Allan, Ontario
 
Enthusiast
2008 MP3 400
Joined: 16 Aug 2008
Posts: 93
Location: Glen Allan, Ontario
Mon May 06, 2019 10:03 am linkquote
2008 400
What possible parts could have failed and what is the most probable?
I metered across the battery and revved to 5000 with no change in voltage.
All fuses are good.
Mon May 06, 2019 10:12 am

Veni, Vidi, Posti
2008 MP3 500, 2013 BV350, 2020 Vespa Sei Giorni
Joined: 13 Oct 2012
Posts: 8726
Location: Ashburn, Va. Home to the Internet
 
Veni, Vidi, Posti
2008 MP3 500, 2013 BV350, 2020 Vespa Sei Giorni
Joined: 13 Oct 2012
Posts: 8726
Location: Ashburn, Va. Home to the Internet
Mon May 06, 2019 10:12 am linkquote
30 amp fuse under the seat.
Pull off the engine access panel in the engine compartment, get a flash light and look for a Relay on the right side (Passanger side in the US) mounted in a black rubber mount with battery cable size wires going to it. You can pull the whole thing off the mount and pull the wiring harness off (one clip on each side) and pull the 30 amp fuse that is under the connector and see if it is good. Pull the fuse, don't just test, I made that mistake.
If it is like mine was you will be buying a new relay as mine over heated and melted the fuse.

Last edited by WEB-Tech on Mon May 06, 2019 10:14 am; edited 1 time in total
Mon May 06, 2019 10:13 am

Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 39898
Location: Pleasant Hill, CA
 
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 39898
Location: Pleasant Hill, CA
Mon May 06, 2019 10:13 am linkquote
All fuses? Including the 'hidden fuse'? The 400 has one, fuse 13 (30A) located on the starter relay.
Mon May 06, 2019 10:32 am

Enthusiast
2008 MP3 400
Joined: 16 Aug 2008
Posts: 93
Location: Glen Allan, Ontario
 
Enthusiast
2008 MP3 400
Joined: 16 Aug 2008
Posts: 93
Location: Glen Allan, Ontario
Mon May 06, 2019 10:32 am linkquote
I had pulled the 30A fuse; it was good.
Mon May 06, 2019 10:58 am

Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 39898
Location: Pleasant Hill, CA
 
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 39898
Location: Pleasant Hill, CA
Mon May 06, 2019 10:58 am linkquote
DennisL wrote:
I had pulled the 30A fuse; it was good.
Just checking you didn't check the spare - and that you *did* check the connections of the fuseholder itself to the main terminals. There can be hidden corrrosion inside. BTDTGTTS...

If the starter relay (and its connections) is in good condition then I'd be checking the stator to regulator connector - the big fat brown one with yellow wires into it. Those are notorious for going high resistance and in at least one case setting fire to the bike.
Mon May 06, 2019 11:20 am

Enthusiast
MP3 400
Joined: 02 Mar 2009
Posts: 74
Location: Exeter
 
Enthusiast
MP3 400
Joined: 02 Mar 2009
Posts: 74
Location: Exeter
Mon May 06, 2019 11:20 am linkquote
I had this problem - it was a wire corroded at the regulator. Easy fix
Mon May 06, 2019 11:27 am

Veni, Vidi, Posti
Neutrino MP3 492.7 AK, 2013 Moto Guzzi Norge
Joined: 29 Mar 2008
Posts: 21882
Location: Harriman, Tennessee, Tn
 
Veni, Vidi, Posti
Neutrino MP3 492.7 AK, 2013 Moto Guzzi Norge
Joined: 29 Mar 2008
Posts: 21882
Location: Harriman, Tennessee, Tn
Mon May 06, 2019 11:27 am linkquote
DennisL wrote:
I had pulled the 30A fuse; it was good.
bet you checked the spare and not the actual fuse.
Mon May 06, 2019 12:49 pm

Enthusiast
2008 MP3 400
Joined: 16 Aug 2008
Posts: 93
Location: Glen Allan, Ontario
 
Enthusiast
2008 MP3 400
Joined: 16 Aug 2008
Posts: 93
Location: Glen Allan, Ontario
Mon May 06, 2019 12:49 pm linkquote
Here is the fuse I pulled and checked.
Is this the 'spare'?
I didn't know there was one.



Mon May 06, 2019 1:06 pm

Veni, Vidi, Posti
2008 MP3 500, 2013 BV350, 2020 Vespa Sei Giorni
Joined: 13 Oct 2012
Posts: 8726
Location: Ashburn, Va. Home to the Internet
 
Veni, Vidi, Posti
2008 MP3 500, 2013 BV350, 2020 Vespa Sei Giorni
Joined: 13 Oct 2012
Posts: 8726
Location: Ashburn, Va. Home to the Internet
Mon May 06, 2019 1:06 pm linkquote
Pull that red connector off, it is under it. Right under where the side clips are.
Mon May 06, 2019 1:53 pm

Veni, Vidi, Posti
Neutrino MP3 492.7 AK, 2013 Moto Guzzi Norge
Joined: 29 Mar 2008
Posts: 21882
Location: Harriman, Tennessee, Tn
 
Veni, Vidi, Posti
Neutrino MP3 492.7 AK, 2013 Moto Guzzi Norge
Joined: 29 Mar 2008
Posts: 21882
Location: Harriman, Tennessee, Tn
Mon May 06, 2019 1:53 pm linkquote
yeah the one you see that visible is the spare. the other is hidden under the connector, that's why its called the "hidden fuse"
Mon May 06, 2019 1:56 pm

Enthusiast
2008 MP3 400
Joined: 16 Aug 2008
Posts: 93
Location: Glen Allan, Ontario
 
Enthusiast
2008 MP3 400
Joined: 16 Aug 2008
Posts: 93
Location: Glen Allan, Ontario
Mon May 06, 2019 1:56 pm linkquote
Well...what a relief!!
Thanks to all of you I'm good again.
Did a rev/voltage test...14.8 @ 5000 rpm.

Gotta love this site...you guys made my day!!





Mon May 06, 2019 2:44 pm

Veni, Vidi, Posti
Neutrino MP3 492.7 AK, 2013 Moto Guzzi Norge
Joined: 29 Mar 2008
Posts: 21882
Location: Harriman, Tennessee, Tn
 
Veni, Vidi, Posti
Neutrino MP3 492.7 AK, 2013 Moto Guzzi Norge
Joined: 29 Mar 2008
Posts: 21882
Location: Harriman, Tennessee, Tn
Mon May 06, 2019 2:44 pm linkquote
glad you up and running again.
Mon May 06, 2019 10:54 pm

Hooked
Joined: 06 Nov 2014
Posts: 297
Location: Uk rochdale
 
Hooked
Joined: 06 Nov 2014
Posts: 297
Location: Uk rochdale
Mon May 06, 2019 10:54 pm linkquote
well done to you all.
Tue May 07, 2019 12:09 am

Molto Verboso
Kymco AK550
Joined: 09 Feb 2008
Posts: 1163
Location: UK
 
Molto Verboso
Kymco AK550
Joined: 09 Feb 2008
Posts: 1163
Location: UK
Tue May 07, 2019 12:09 am linkquote
That fuse was probably blown because you or somebody else made a mistake while investigating the battery problem. Most likely reversed the polarity or possibly tried to jump start with another bigger vehicle with the engine running.
Your excellent picture clearly shows that it melted though its not so easy to say how quickly. It probably saved your electrics from far more serious damage. But in the very unlikely event that it blows again you will need to look for a bad short circuit.
Tue May 07, 2019 2:06 am

Veni, Vidi, Posti
2008 MP3 500, 2013 BV350, 2020 Vespa Sei Giorni
Joined: 13 Oct 2012
Posts: 8726
Location: Ashburn, Va. Home to the Internet
 
Veni, Vidi, Posti
2008 MP3 500, 2013 BV350, 2020 Vespa Sei Giorni
Joined: 13 Oct 2012
Posts: 8726
Location: Ashburn, Va. Home to the Internet
Tue May 07, 2019 2:06 am linkquote
roadster wrote:
That fuse was probably blown because you or somebody else made a mistake while investigating the battery problem. Most likely reversed the polarity or possibly tried to jump start with another bigger vehicle with the engine running.
Your excellent picture clearly shows that it melted though its not so easy to say how quickly. It probably saved your electrics from far more serious damage. But in the very unlikely event that it blows again you will need to look for a bad short circuit.
Just replace mine, it is a common issue on the MP3 500.
Tue May 07, 2019 6:13 am

Enthusiast
2008 MP3 400
Joined: 16 Aug 2008
Posts: 93
Location: Glen Allan, Ontario
 
Enthusiast
2008 MP3 400
Joined: 16 Aug 2008
Posts: 93
Location: Glen Allan, Ontario
Tue May 07, 2019 6:13 am linkquote
This post is an (unplanned) continuation of my previous thread
stabilizer lock light flickering with buzzing sound

My bike had died away from home after 50 km of riding. That was how far it went on battery power alone with a disabled charging circuit (unknown to me at the time). I called my wife who picked me up with the dead battery; I charged it at home for a few hours, came back, installed it and rode home.
All this from a quick reverse connection. I've certainly learned my lesson!

Question: What are the issues with getting a boost from a car battery?
Is there a proper way to do it or not?

Dennis
Tue May 07, 2019 7:42 am

Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 39898
Location: Pleasant Hill, CA
 
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 39898
Location: Pleasant Hill, CA
Tue May 07, 2019 7:42 am linkquote
DennisL wrote:
Question: What are the issues with getting a boost from a car battery?
Is there a proper way to do it or not?
Jump start is fine, see below. However to boost a bike battery from the car, it's really advisable to remove the bike battery from the bike. Then you can connect it to the car battery and start the car. Half an hour on a car alternator should be quite enough to charge the bike battery.

To jump start:
Do not have the car engine running.
Connect the positive lead first. Double-check it's on the right terminals...
Connect the negative of the car battery to the frame of the bike.
Start bike.
Remove negative lead first.
Remove positive lead last.
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