I am having problems with the car charging the battery and it dies out if kept running. Battery holds a 12.3V charge without running. There has been two new batteries and the original alternator has been replaced. The old one was checked after and turned out too be good but discarded anyway due to age and labor; it was not worth removing again. Now the battery ground cable has been tested good and shows a good connection with multimeter from alternator casing to battery ground terminal. Also the posititve wire on the alternator has good connection to the pos terminal of the battery. Battery fusible links are also all good yet the car will not charge to 14volts regardless. The gauge cluster did lose gas gauge needle readings etc. when it died out. Any idea where to check next behind the dash resistor, etc?