Possibly the keyswitch.
if the starter is not spinning and the truck motor is running
If the engine stops running when the key is released, then the ignition switch is probably bad. The switch will need to be replaced.
Have you tried changing the ignition switch?
replace the balist resister replace the balist resister
If it starts but doesn't stay running after you release the key from the start position, it means your ignition switch is bad. Not a huge expense.
Cycle the ignition switch on and off several times pausing briefly in the on position. This will prime the fuel system.
The function of a stop switch is to cut the ignition so the engine can stop. If the switch is in the off position and the engine isn't running, then to start the bike you'll have to put it to the on position.
Bad ignition switch?
Turn on the A/C and then turn the ignition to the on position without starting the engine. The fan will be running if it is good.
There is no such position in baseball. The running back position is used in American football.
Depends if you have the ignition running or just the say you left the lights on. If you just left the ignition on all night nothing will happen except just running out of fuel. If you left your lights on without ignition running your battery will die.
If you are hearing it while the ignition key is in the on position then it is the blower motor running on low speed. It can also be the air distribution motors resetting themselves.