Eddie,
lets narrow down the problem.
First turn on the lights and see if they work, if they work but the engine won't crank, your batteries are ok and you need to look at the starter circuit. If the lights won't come on, you need to look at the battery, battery cables and ground connections to make sure you have juice.
To check the starting circuit, try this. On the starter solenoid, you should have a positive cable coming from the battery, make sure you have battery voltage there be it 12 or 24V. On the solenoid there is a smaller wire coming from the starter switch that will energize the solenoid, make sure it is connected securely. If it is, try cranking the engine over by jumpering from the large wire coming from the battery to the small wire coming from the starter switch, if it cranks, you problem is somewhere in the starter switch circuit. Chase the wires and make sure all the wires are securely connected to the switch. Also check the switch with an Ohmmeter or a testlight to make sure the switch is in good shape.
Hope that helps and good luck.
Derek