every now and then ill be driving down the road and my lights will dim and my radio will cut out but remain on. almost seems as if my battery is getting weak. the battery and alternator are both about a year old. i havent had either tested, but i did test them with a volt meter and the bat. with the key off is 13.00 volts and with the car running its about 14.20 so whats up. any ideas? i havent messed with any wiring in the past.

 

Go get them tested - any Advance or Auto Zone, Oreillys, etc can test them in the car, in their parkinglot, and it's free!