Ok, Testing for alternator charge is easy. You need a multimeter, or a voltmeter. Set the multimeter to VDC. Black Negative to Battery Negative, Red positive to battery positive. See what you have in the battery. Normal, according to the US Marine Corps, full charge is 12.65 Volts. Yours may vary. Start the engine, and see what it reads. Should be between 13.5 and 15 Volts. If it isn't, you may have the wires crossed on the alternator. Happened on mine by the previous owner. It should go BAT, Blue wire, Green wire on a 70 and newer. If thats good, check your voltage regulator, it may be bad. It should be on the firewall, and they aren't too expensive. If it does the same thing with a new regulator, you need a new alternator or yours rebuilt. Hope this helps. John