14.7 volts is a tad high for the alternator to be putting out. If you have a bad ground it could be causing al of these symptoms. Check the ground at the battery by using a digial voltage-ohm meter. Put the meter on the ohm scale. With the negative battery cable hooked up run a lead to the negative battery post and with the other lead put it anywhere on the engine. You should only a few ohms resistance. If more than that clean and tetighten the cable end. To check for a bad ground to the body do the same thing only run a terminal from the neg. battery post to the bodyl. Should have only a few ohms resistance. If more than that run a large gauge wire from the negative side of the battery to the body to establish a good ground.