tank wont start

[cucarrell]

My tank 150 just clicks once each time I try to start it. If I do it about 100 or more times, it eventually turns over a bit and starts. I thought it may be the starter, so I put a new one on. Same thing. Click, click click. It does also make a clicking sound when I ride it, and the headlights flicker. Can anyone tell me where to look in the wiring to possibly see a problem, or is it another issue?