hi.just checked out my primary and secondary ignition coil ,,and although it is a budget meter i am getting the following
primary ..should be 3.4-4.6.......reading 4.9
secondary ..should be 10.4 -15.6...reading 23.1

maybe the ingnition coil is faulty?...still awaiting delivery of a new starter solanoid

Well, those readings are out of spec, but wouldn't necessarily cause a short and blow a fuse. Higher than normal resistance is either windings of the coil usually mean a poorer than normal spark, difficult starting, rough running, misfires, poor economy etc. They do cause higher current levels, but small increase in resistance isn't necessarily going to generate over 10A to blow a fuse. If the coil was blowing the 10A ignition fuse you'd expect to see a short in the primary windings and either no resistance at all or a near infinite reading (depending of the nature of how the windings have failed)?

Then again. your problem is intermittent, so testing isn't always going to show up the problem?

hi thanks again for your prompt reply...i fitted the replacement relay unit..bike started fine and ran for a minute then i blibt the revs a few times ..up to about 3k and the fuse blew again..i put in another fuse and it blew immediately....same as happened with the origional relay...so i can discount that...oh well back to the drawing board

Will the fuse stay intact if you start the bike and leave it at idle for several minutes? Does it only blow when you rev it?

Have you checked the charging voltage? Put your multimeter (set to 20V DC) across the battery terminals start and rev the engine. See what sort of readings are you getting?

yes if i leave it for a while the bike can run at tickover so far i ran it for about a minute .stopped it ran it again for about another minute on tickover then reved it.the fuse blew and replacement fuse blew immediately when i restarted it...this has been the pattern ,on one attempt it ran for about 20 second then blew without reving...i will take a reading soon and report my findings...i have removed the tank and cant see any indication of worn or abraded wire ,all looks as new as it should be..thanks again for you help in this matter

hi ...put the tank back on and tried to start it yesterday it blew the fuse straight away..tried again today and it started ran it for 30 seconds i stopped it then started it again and it continued to run allowing me to take measurements across the battery...reading 12.70 pre start up...then upon staring at tickover climbed quickly to 13.66/13.77 revved it to 4k and it read at 13.91..done this several times over a couple of minutes then it blew the fuse...??????

Right, so it isn't a regulator/rectifier fault then. :eusa_think:

It's definite that it's fuse 4 blowing each time? Not fuse 5? And you've double checked the injector wiring hasn't rubbed through on the upper RH frame rail?

I'll have to sleep on this one and see if I get any further inspiration...

That's it its official i am a twit!...all along you have mentioned fuse 4 never picked up on it ...it is in fact fuse 5 the 10 amp ECU fuse that has been blowing all along...i am so sorry ...but does this clarify things a bit better

ignition fuses blowing on tenere 660z
 

Right then... If it isn't the injector wire that's worn through in the frame where it comes out from the main loom under the tank, then I very much suspect that you have a dodgy fuel pump (or possibly fuel pump/FI relay). This would explain why it runs for a bit and then dies. Fuse 5 is the fuel injection circuit.

no wear indicated at loom for injector wire...so you think a faulty pump or relay would blow the fuse immediately and sometimes after running for a short time...i had a huge panic in case it was requiring a new ECU �700 plus other no doubt expensive bits n bobs