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This must be a light bulb on somewhere, have done hundreds of cars for this problem, and with a few exceptions only a light bulb draws enough current to run the battery down that fast. Check everywhere and do it in the evening. Check the sun visor lights, check the trunk light, hood light interior lights like glove box and console. I have found just a few exceptions to this, one is the electric fuel pump is running due to a sticking relay, the other is the Alternator. has a defective diode and is shorting to ground slowly. Make sure the fuel pump is not running, it makes a humming noise best heard with the gas cap removed. Disconnect the Alt. as well and see what happens if all the lights are checked and no issue found.
the clicking noises you are hearing are the relays powering up, that is normal. with somebody in truck try starting itw ith somebody under truck at the gas tank, take a rubberm allet and bang on the tank in the center of it while cranking, if it starts you need a fuel pump. make sure you have gas in tank the sending unit on the fuel pumps go bad all the time.
the motor is cranking. that tells us you have a good starter and battery. now we need to see if the fuel pump works and if you have spark. what you need to do is turn the key to the start position and see if you hear a buzzing noise from the gas tank. if you hear a buzzing noise the pump is good. have to see if you have spark. is the check engine light on
there could many different problems. do you have any check engine codes? if so have them checked out, because a sensor may have failed causing the engine not to start. then you need to check the fuel pump. stand by the fuel tank and have someone turn the key on, but dont start the car. listen very closely you should hear a small electric motor run for about 5 sec. if you dont hear anything, check the fuse and the relay. when you turn the key on the relay should make a fairly loud click. if no sound is heard the relay needs to be replaced. if you still dont hear the motor your fuel pump has failed.
turn the key on( DONT CRANK IT) and listen near the fuel tank for a humming noise, it sould last about 3-5 sec, you are listinging for the fuel pump. If nothing is heard have your fuel pressue checked, chances are the electric fuel pump in the gas tank has failed.
fuel pump??? two ways to test one good, one not so good. fist, without cranking over the motor, have someone go and listne in the back where the fuel tank is and try and here if there is a whirring sound when the key is put in the on position. you might not be able to here it. second (have a rag handy) undo one of the fuel lines and see if there is any pressure going to it = if none = dead fuel pump. third way....if it is easy to access the top of the fuel tank where the pump is, do so. remove pump and see if it works. also, if its an externally mounted pump, gently tap it with a wrench on the outside of the pump casing...this an actually make them work for a short time.
if its petrol engine bang bottom of fuel tank while some one else cranks vehicle over if it starts good just pump jammed if it dont buzz to life and you cant hear fuel pump buzzing ceck for power to it if thats there replace pump. running out of fuel kills electric fuel pumps internally in petrol tanks.
if its diesel you must bleed fuel system taking extreme care if you un do lines some very high pressure