Attach battery charger to battery. Turn it on.

Answered by Wrenchtech (expert)
14,743 answers provided

Remove cables from battery and connect positive to positive and negative to negative. Preferably use a car charger with a built in meter so you won't overcharge. If not, use a voltage meter to check bat. until voltage measures 12.6 volts.

Make sure your bat cables are good and clean, and that your alternator is properly recharging the bat.

Answered by Ernest Clark (expert)
1,762 answers provided