Dead Battery!

As auto tech for some 33years,the easiest way to help determine a electrical problem is start with a battery that is good,one that is fully charged from a nother car,and start from there.If the car starts,you check the chargng system for proper voltage and amps to show the regulator and alternator and working,and the wiring.If this is good,you check for current draw at the battery with the key off and doors closed and keys in your hands and every thing off that you know off.I normally do whats called a parasitic draw test.You remove a battery terminal,and place a multi meter of good grade,OTC/snap-on to the amp setting of 5 amps.The meter should read a digital signal of 0.030-0,050 of one amp as being normal draw for memory for radios and ECM,s.If you get any where near the 0.100 or beyond,you have a good size current draw and needs to be located.That we cover later.Starter draw should be less than 2 volts from a fully charged battery.Meaning that if the battery is showing you have a fully charged battery at 12.5-13.0volts and it drops to less than 10.0 volts when cranking, you either have a low battery or a bad starter,a amp probe shows how many amps the starter is drawing.You can charger your battery for a 24 hour period and have it checked at a auto shop and see if it is holding a charge,while under load,if it fails,install a new one of the maximim rating you can find and the largest size you can fit in the car.Mrmopartech