The accessories switch on my 2000 heritage softail classic will not engage. Removed and cleaned switch, reinstalled, turned switch to accessories before complete reinstall. Brake, horn,signal

Have you checked all your grounds sometimes you a loose ground will not or will lose connection on the ignition switch you should have two hot coming in and then when you turn it on and energizes the switch as long as you still have battery voltage there when you hit the start button you should be fine but start with your grounds for

It's located behind breaker box you have to lay on ground and their are 2 10 mm bolts that hold on black fender in front of rear tire remove those and lift up the top just hooks on and slide all the way down following contour of tire and then you can see inside ant their will be a little box with two studs and wires on each post that is your 30 amp breaker

Kinda sounds like your starter solenoid is shot

Try to change the sparkplug.Try to change the gas.maybe there's a water mixed.