Check to see what rating your alternator and battery are, i.e. a 120A alternator and a 75ah battery, the CCA number on the battery is not important for this. Now to do some sanity tests on your equipment. First put the multimeter wires in the position for voltage and the dial in the less than 20V position and touch the wires to each battery post and check the battery voltage, if its not starting I'm guessing its in the 11s. It should be like 12.4V. Then you can check the alternator is charging the battery, turn the car on and touch the wires to the battery posts again, it should be about 14