Question about 1975 kawasaki Z1B

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Zi 900 short circuit

1975 Z900. Coming home it started backfiring and cut out alogether. I fitted a new 20amp fuse,but every time I turn the ignition on the fuse blows. Where should I look for the short?

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Hi ...... Could be almost anywhere. Have you recently had any work carried out ? Gonna be a 'long' process but try with ignition off, change fuse, and one after another disconnect main/plug connectors in the loom ................ with any luck you'll isolate the problem to a section of the loom or component. You may need a few fuses. Finish off with a multimeter.
Let us know how you get on.

Posted on Jan 07, 2009

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How to prevent electrical short


Paul
Somewhere there is a short circuit allowing the current to flow straight to earth on the engine or the frame. Blowing a 10 amp fuse means this is a very heavy current so do not be tempted to either fit a higher rated fuse or bypass the fuse. Almost certainly this would cause burnt out wiring and possibly start a fire.

This happened when you switched on the ignition and before you pressed the starter on one occasion. On other occasions the bike has started before blowing the fuse. This suggests that perhaps wiring with damaged insulation is making and breaking contact.

You said you have a new battery. Is it possible that during the fitting of this some damage was done to the wiring? Do you have a meter or can you borrow one? See if you can find out where this current is running to earth without replacing the fuse. ie check after the fuse with a meter.

At times like this it is good to have a friend that is an electrician to help you check.

Good luck.

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