Z1OwnersClub GB

can anyone give me a clue as to why my 73 z1 has started blowingthe main fuse. i fitted a dyna ignition and coils over the winter, the bike did about 500 miles then started blowing fuses. it runs for about a minute no probs then blows the fuse. tested the regulator and wasnt getting the correct results so bought a new reg/rec unit. just fitted it, started her up, ran for about 2 minutes and blew the fuse. any help would be greatly appreciated.

Classic leakage short somewhere does it blow quicker if you turn on the lights or indicators check oround the stem where the wires pass by the the tanks for signs of obvious heat, black bits etc trial and error and looky see is the only way but start with the circuit you disturbed to replace the sparkies

thanks keith, hard to tell because usually it blows after a minute or two then occasionally it blows within a few seconds. checked round the loom and cant see anything obvious. guess i will have to start disconnecting everything.

Does it blow the fuse with the ignition just switched "ON" & the engine not running, or only when the engine is running ?

Also check condition of wires going into fuse box ,best change to blade fuses as quality of some glass fuses are shite

Try this chap

Replace the fuse with a 21 watt indicator bulb. As the electrical circuits are switched on the bulb will glow dimly, if a faulty circuit is connected the bulb will glow brightly. If the bulb glows bright with nothing switched on, remove wires from components in turn until the bulb goes out, the last one removed will be the area of the faulty circuit.


Apologies to Boyer but this does work Cheers Paul J

Good Call Paul but I would like to add KEEP A LOOK OUT FOR SMOKE and if you spot any get it off quick smart

That's a good idea Paul!!!

dont know, will try putting a new fuse in without starting it up, see what happens

PIRELLI wrote:can anyone give me a clue as to why my 73 z1 has started blowingthe main fuse. i fitted a dyna ignition and coils over the winter, the bike did about 500 miles then started blowing fuses. it runs for about a minute no probs then blows the fuse. tested the regulator and wasnt getting the correct results so bought a new reg/rec unit. just fitted it, started her up, ran for about 2 minutes and blew the fuse. any help would be greatly appreciated.

Can you outline above more in depth and how you fitted combined unit?
You should be getting 50 v ac across any 2 of the genny phases and no more than 14.6 v dc across the battery terminals when bike is running.

seem to remember the main fuse terminals on this model corrode and go high resistance causing the fuse to blow..............or could be the scrumpy jack tonight........

Try disconnecting the wires from the front brake presure switch ( on the splitter on the front yoke ) these can go down to earth internally.

You cn confirm this by testing each pin on the switch for continuity to earth - if you have continuity on either of the terminals switch is cause and you need a new one

SID

sid123 wrote:Try disconnecting the wires from the front brake presure switch ( on the splitter on the front yoke ) these can go down to earth internally.

You cn confirm this by testing each pin on the switch for continuity to earth - if you have continuity on either of the terminals switch is cause and you need a new one

SID

in with a bullet! I'll store that one ! (great hint by the way)

was it sorted ?

sid