Is a s5029 solenoid 6 or 12 volt?

Check the solenoid with a volt meter and make sure it puts 12 volts to the starter when button is pressed. If meter shows 12 volts then the stater probably needs starter cable lugs tightened, new brushes or the whole starter. If the meter shows low voltage when button is pressed then check the wiring and lugs between solenoid and battery. And some bikes may have a fuse that feeds the cable to the starter solenoid.

well having lights still means battery power is available but how much,check battery volts should be 12.5 volts, if battery volts below 10 volts the starter solenoid hold in and pull in winding wont be enough to drive starter solenoid and starter. if battery okay.make sure battery cables battery posts is clean from corrossion.if all is good, have starter and solenoid checked out at auto zone or advance auto parts.if you hear clicking under the hood look for faulty starter relay

Make sure the battery cables are tight to the posts. The starter takes alot more current than the headlights and will require more tight of a connection.