Hi all wondered if you could help me at all as I’m not the most mechanically minded.

 

yesterday I was almost at work and slowed down to drive into the car park and my bike cut out no electrics no lights nothing.

 

what would be the process of elimination to check what’s up with it? I have a Haynes manual .

 

a few times I checked on the bike and sometimes when turning the ignition on it made a spluttering noise like a drowning man but then it’s stopped and later on nothing at all.I tried to jump start it with a battery pack but that did nothing .the fuse seems ok as it’s not broken but it looked as old as hell.

 

thanks in advance 

First off, change the primary fuse (it may be invisibly broken), no point going further till you've done that...

Can it be invisibly broken if the element is not broken

Have you tested it with a multi meter?
Yes, it can have a hairline crack in it.