When the Jeep was new the volt meter read 14 volts....now the volt meter reads 13 volts with a one year old battery. Since the battery is a 12 volt battery should there be any concern that the volt meter reads 13 volts rather than 14 volts?

Generally the standard voltage should be 13.5 to 15.5 depending on the load that is being put on the vehicle and age of the battery an older battery may require more voltage to charge. Unless the voltage drops below 13 you are probably ok.

Your voltmeter display what is called dynamic voltage... this is the power available from the alternator output. 13 V does sound a little low, but to know for sure you should have an output test performed on the alternator (the amperage reading is more telling then the voltmeter reading on your dash) and have your battery tested. that being said, 13V is not going to leave you stranded anywhere, but should be checked out before it gets worse and does! good luck!

It needs to be looked at,hook a volt meter to the battery,and start the engine,turn the ac on high blower,and the head lights on,the alternator should be putting out 13.65 volts to 14.25 volts,if it is any lower than this,replace the alternator,now,if the reading is not the same as in the vehicles volt meter,then the cables,positive and negative need to be replaced,the cables get old,and corrode on the inside and break down,they do not carry the current as they should.Shuold you decide to replace them,go with a larger diameter cable,both positive,and negative.