Turn on head lights and blower motor and try horn and wipers.
If they all work good find the purple wire going to starter solenoid and ckeck for 12 volts on it in start position.
If 12 volts to it and no start and all battery cables are good and battery is up.
Starter or solenoid may be going bad.
Give the starter a good tap on bottom with a hammer.
If no 12 volts in start position on purple starter solenoid wire start back tracking to saftey switches and gear selector and ign switch. Wiggle gear selector if auto trans.
MT