Kawasaki vulcan 1500 tail light intermittant problem

Question edited for clarity.
Question moved from Cars and Trucks.

It can only be the headlight switch or the wiring.

The brake lights work from power, plus the brake switch and the lamp.

The headlights work from power to headlight switch to the headlight lamp and the tail light lamp.

https://www.google.com/search?q=2007+kawasaki+900+classic+headlight+wiring+diagram

Apparently the headlight does work via a relay so test that.

https://www.google.com/search?q=2007+kawasaki+900+classic+headlight+not+working

...

nasty carb, blocked fuel line, not enough spark.

sounds like a dead short from battery to ground follow your tail light wires all the way back and check for bare or overheated wires

it must be an wiring problem in rear / middle part of a bike.

The ignition switch has three positions. Off at 6 o'clock, on at about 7 o'clock and park at 9 o'clock which will leave the tail light on and also shut the bike off. Just have to make sure when you turn the ignition off that the key is straight up and down.

The following wiring diagram applies for Kawasaki VN800 Vulcan motorcycle series. Herein you will find complete and clear description of ignition switch, radiator fan switch,temperature sensor, radiator fan, handlebar switches, rectifier, speedometer, headlight, spark plugs, tail brakelights, signal lights, alternator and battery.http://www.mediafire.com/?eztezdedw0n

try this check the bulb if bad when u put another one in use paper so you dont get oil on the bulb from your fingers this causes the bulb to burn out quicker alson check the switch on the brake might have went bad .if not check all wires make sure all looks pluged in also you should check the fuzes hope this helps

Have 2002 Vulcan 1600 Drifter. The tail and brake lights will not work. They were working rear turn signals do. It blew the fuse twice, now it is not blowing the fuse but still no lights. Got power to the fuse and leaving it not arriving at the rear light. The plug in,before it goes inside the rear fender, what color wires are what so I can check if things are arriving there O.K.?