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Reasons for main fuse blowing (NC24)

Posted: Sun Jun 17, 2012 7:54 am
by Utopic
Hey guys

I'm still having a few electrical issues. After replacing my CDI, starter solenoid and reg\rec my bike rode well for a few months but with a charging issue. I then replaced the stator and the charging issue went away. My reg\rec blew and I replaced it taking lots of care to insulate all the connections to prevent a short. My fan won't switch on for some reason too. So my main fuse has blown and I'm worried about just replacing it. What do you think could be the cause?? I can only strip the bike tomorrow to take a squiz so I'd like to have an idea of what to look for so I can get the problem sorted once and for all.

Re: Reasons for main fuse blowing (NC24)

Posted: Sun Jun 17, 2012 7:58 am
by thunderace
Could be any number of reasons but I'd start looking for a short circuit.

Re: Reasons for main fuse blowing (NC24)

Posted: Sun Jun 17, 2012 11:12 am
by magg
What rating was the main fuse, should be 30 amp. Under exactly what condition did the main fuse blow? Did any other fuses blow?

As a starting point for a short circuit check:

Ignition switch in OFF position. disconnect the battery +ve lead. Replace main fuse. Connect you multimeter, set to ohms, between the battery +ve lead and -ve battery lead. Should read >1000 ohms.

If not disconnect rect/reg and measure again, if reading now >1000 ohms fault is in rect/reg.

If resistance >1000 ohm then place ignition switch in ON position and take another reading. Should be >1000 ohms, if not then you need to start disconnecting things.

Re: Reasons for main fuse blowing (NC24)

Posted: Mon Jun 18, 2012 11:40 am
by Utopic
Thanks very much I'll try that. It just blew shortly after starting it then again with a nea fuse. I ran an extra ground wire from my regulator to my frame and that seems to heve solved the problem for now. I'm doing a few mods this weekend so I'll do a proper test when I strip her down again