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CHECK BATTERY CABLES MAKE SURE THEY ARE NOT CORRODED AND LOOSE.ALSO CHECK BATTERY VOLTAGE.SHOULD BE 12.6 VOLTS IF NOT REPLACED BATTERY.BEFORE REMOVING NEGATIVE BATTERY CABLE TURN OF RADIO FIRST.AFTER INSTALLING NEW BATTERY.WITH ENGINE RUNNING CHECK ALTERNATOR OUT PUT AT BATTERY SHOULD BE 13.5 TO 14.5 VOLTS.DOING THIS WILL MAY SURE BATTERY GETTING GOOD CHARGE.2 REASON BATTERIES STOP WORKING.THEY FAIL FROM OLD AGE AND ALTERNATOR CHARGING SYSTEM NOT WORKING.IF BATTERY CABLES VERY OLD I WOULD REPLACE THEM.THAT WILL HELP BATTERY GET BETTER CHARGE.OLD BATTERY CABLES PUT A RESISTANCE ON CHARGING CIRCUIT CAUSE ALTERNATOR WORK HARDER TO KEEP BATTERY CHARGED WHICH WILL SHORTEN THE ALTERNATOR LIFE.
It could be the battery. Check to see how old is the battery. Sometimes batteries have punch out dates listed on them to show when it was purchased. This will let you know how old it is and probably need to be replaced.
Put a pair of jumper cables on the battery terminals and connect it to another vehicle. When you remove the battery the other vehicle will power your memory and electrical system as a surrogate while you perform the swap.