my car seems to run great until it doesn't i have changed the battery in my car in the bast 3 months back to back the problem im faceing is that my battery has be directly wired to my alternator the car will lat for week and then out no where wont wanna start my hypothesis that my car needs to be completly re wired
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Couple of things to try:
Check that the alternator is charging the battery OK.
With the transmission in Park (AT) or Neutral (MT) and the parking brake (emergency brake) firmly applied, start the engine. Use a voltmeter and check the voltage across the car's battery terminals. It should measure between 13.8V-14.5V DC. If not then there's either a problem with the car's voltage regulator or the alternator.
Be safety aware of where you place your hands etc and also tools and if you're wearing loose clothing etc, if you try this, as the engine is running!
Check if there is a parasitic current draw on the battery.
With the engine switched off, disconnect the negative battery cable from the battery terminal and connect an Ammeter between the the negative cable and the battery's negative terminal and measure the amount of current that is flowing. The acceptable amount of current that is usually flowing is ~50mA (0.05A). If more than this you need to pull the fuses, one at a time to find out which circuit is drawing too much current when it shouldn't be. Here's a link that explains it better than I can.
Voltmeter and Ammeter are both functions found in a DMM (digital multimeter)
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