2002 GMC Safari 4.3L does a clicking/ticking sound by the area of the alternator indicate while the motor is running indicate a bad cap and rotor as the dealer has told me or??

make sure your fluid it up

Check your switch that runs to your aternator.make sure is grounded .if not get a sand paper and sand it down.also check the switch that plugs in to the alternator.

You need fuel, spark at the right time, and compression for the engine to run.
You'll have to figure out if it is a fuel or ignition problem if the compression is ok.
The list includes low fuel pressure, cap-rotor-wires, spark plugs, coil, ignition module, various relays and fuses, and the computer.
Even the key switch could be faulty.
I would check for trouble codes first.

There is a good possibility the fuel pump is bad, or you have a spark issue, such as a cap, and rotor, or a coil, or coil wire. The fuel pump should put out 55 psi, and run when cranking. Good luck...

Usually a dead cell will show normal to low voltage on a voltmeter but it won't allow the car to start. I'm not sure on the electrical mechanics of it, but it has something to do with the battery not being able to run a return current through the starter when you're trying to start it. If the car will start up fine with jumper cables then the battery is most likely dead.

P0301 is a DTC code that indicates a misfire to cylinder one. It could be a bad spark plug, spark plug wire, rotor and cap, a dirty fuel injector, or the worst a bad head gasket. Cylinder 1 is the first cylinder on the drivers side, towards the front. Start with the simple and check the spark plug wire and add fuel injector cleaner to the gas tank. Good luck and hope this helps you get you van running 100% soon. If that did not help, then your going to have to do a tune up by replacing the spark plugs, wires and rotor and cap. You can get all the parts you need at Auto Zone and they can give you the step by step to get the job done with common tools in under 2 hours of your time. Keep me posted, be glad to know you got your van running 100% again soon.

timing position sensor on the block or at the crankshaft pulley.If not the computer is most likely bad

sounds like a bad plug wire, take a squirt bottle while the car is running then spray the wires down they should start arcing, also when you replaced the fuel pump did you replace the fuel filter

Sounds like the blower motor resistor is bad. These things go bad all the time. and for the switching modes there is a vacuum line that runs under the window in the engine compartment and runs by the alternator, its tiny and may take a few minutes to find. check first by the evaporator case and follow it by the alternator to the driverside of the throttle body. these too break and will not allow the heater mode changes. the blower motor resistor controls the fan speeds and the vacuum line allows which vent the air flow goes through.

the codes ur getting will be thrown by a vacume leak make sure u dont have a vacume line leaking or split also check ur pcv valve for clogging