Motorcycle Repair: 1999 Kawasaki Vulcan 1500 problem, kawasaki vulcan 1500, radiator tank

Question
Turned key on my 1999 Kawasaki Vulcan 1500 today and the starter relay behind the radiator tank on the right made a click for 1 second before all power was lost (all lights out). Checked battery first, fine. Checked all fuses fine. Tried starting bike and starter relay clicked for 1 second and again all power was lost. I waited 1 minute and it started with no problem.

While accelerating, it occasionally backfires and seems to loose power for a second then comes back. Idles fine.  Any ideas

Answer
Hi Jay,

There are quite a few circuits that could cause problems but
most likely either a faulty ignition switch or a junction box
internal relay is bad.

Also check for loose battery ground to the frame or poor connections on the
battery and starter solenoid relay.

The junction box has a few internal relays but the unit is not
serviceable, it must be replaced. Some of it might be possible
to bypass with the help of a wiring diagram and some
electrical skill.

Here is the wiring for the starter circuits and junction box,
it might help you find the break in the power if you
have a multimeter or test light.

http://members.shaw.ca/wsamel/vn1500-elec.pdf

It can be tough to find intermittant faults but if you
notice anything else you can let me know.

WS
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