14HP Briggs Electrical question

I've got a huskee lt4200 lawn tractor with a 14hp briggs motor. I purchased it used, once in a blue moon when I go to start it it doesn't want to do anything until I tighten up the battery terminals. Today, that happened, only when I tightened them it continued to do nothing at turn key. The battery is good, I even tried jump starting it off my car, still nothing. That makes me believe there is something going on that's not the battery or post terminals. I don't know much about electrical, but anything else i'm quite handy with. Does anyone know what could be the issue? Bad ground possibly? bad solenoid (it doesn't make any noise)? Any thoughts would be appreciated.