make sure everything is tight.
Get a cheap test light
first have someone to turn key switch to start position take test light check red wire going to starter if it lights up but want start bad starter, if no light there go to siliniod check yell/red wire if you got power there bad siliniod, if no power there go to key switch check yell/red connection there, if no power on yell /red wire with key in start position replace key switch. if power at the key switch check neutral safety switch. hope this helps