Main 40A fuse keeps blowing - MVAgusta.net
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post #1 of 13 (permalink) Old 05-14-2018, 01:57 PM Thread Starter
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Main 40A fuse keeps blowing

Evening guys.
I have a 2010 F4 which I rode into work this morning with no issues. When I went to leave i thumbed the starter and the engine turned over for a split second then the 40a fuse blew. I put in a spare fuse and it blows instantly even with the key turned off. I have looked at other threads on here but don't seem to find a similar issue of the fuse blowing as soon as it is inserted.
Any ideas?
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post #2 of 13 (permalink) Old 05-14-2018, 02:01 PM
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There is a dead ground in your charging circuit.

Look for cut or pinched wires.

Start at the battery positive lead as it may be touching the frame.

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post #3 of 13 (permalink) Old 05-14-2018, 02:33 PM Thread Starter
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Quote:
Originally Posted by silentservice703 View Post
There is a dead ground in your charging circuit.

Look for cut or pinched wires.

Start at the battery positive lead as it may be touching the frame.
Thank you Sir, I will take some tools to work with me tomorrow and have a look.
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post #4 of 13 (permalink) Old 05-14-2018, 03:10 PM
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Had anything been done to the bike just prior to the issue appearing?

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post #5 of 13 (permalink) Old 05-14-2018, 04:04 PM Thread Starter
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No its been running fine, been in constant use for the last few months
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post #6 of 13 (permalink) Old 05-14-2018, 04:06 PM
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Ok. Something probably rubbed through or shifted.

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post #7 of 13 (permalink) Old 05-14-2018, 04:13 PM Thread Starter
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I follow your advise and start at the battery and work my way along the wiring, I take it as it blows the fuse with the ignition off it must be a permanent live circuit and nothing to do with other circuits such as lights indicators, etc which are only live on ignition.
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post #8 of 13 (permalink) Old 05-14-2018, 04:22 PM
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Check the start solenoid, right behind the battery on your bike. It is a source of problems on occasion as the connector can corrode and become high resistance. Of course you should know its location due to replacing the 40 amp fuse...

Name:  F4 2010 Start Solenoid.jpg
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post #9 of 13 (permalink) Old 05-14-2018, 06:47 PM
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Disconnect the negative battery terminal connect an Ohm meter to the negative wire
touch the other end to the output terminal of the alternator......got continuity? it's between the battery and alternator
Remove the output wire from the alternator.....touch the alternator terminal got continuity? it's the alternator
Remove the battery wire from the solenoid, check the wire to the battery
Remove the fuse check both fuse sockets

You should have found it by now.......try to move the wires as little as possible


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post #10 of 13 (permalink) Old 05-15-2018, 04:09 PM Thread Starter
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A massive thank you to silentservice703 and the knurl. I spent the day today following your advise, I disconnected each cable one at a time cleaned all the connections and reconnected. Having removed the fuel tank I had access to the connectors in the pictures, each one opened up and cleaned. Once I was done, replaced the fuse and job done. My only concern is that not really knowing which cable was at fault there is always going to be a doubt in whether it is cured or will raise its head again which out on a ride, but for now all good. Thank you guys.
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