I HAVE AN 82 FORD 150 XL 6 CYLINDER 4.9 L ENGINE. MY ALTERNATOR SEIZED WHEN I WAS DRIVING. I REPLACED IT WITH A REBUILT ONE - 100 AMP. THE NEW ALTERNATOR IS NOT CHARGING THE BATTERY. THE VOLTAGE IS 12.3 THE BATTERY IS A BOSCH PREMIUM POWER PART #35-640B / CCA O DEGREE F 640 / CA 32 DEGREE F 770 / RC MIN 25 AMPS: 100 . THE BATTERY IS APPROX. 5 WEEKS OLD. I HAD TO REPLACE THE REGULATOR APPROX. 7 YEARS AGO, WHEN ANOTHER BATTERY FAILED. DID I DAMAGE THE BATTERY OR THE ALTERNATOR. IS THIS BATTERY GOOD ENOUGH?

THANKS FOR YOUR HELP

EDDIE, May 2009

With the engine running, look for around 14.5 volts with a meter across the battery. You could well have bought a dud alternator here, but be aware that if the battery leads are disconnected at any time with the engine running, then the alternator will fail.

John, May 2009

you need to do a load test on battery to see if it is holding charge take to auto lec to test voltage out put

mkarz, May 2009