as in the video, sometimes when idling my Silverado voltage gauge is all over the place. It doesn't seem to do it while driving. I also know its not the gauge, as I have checked with a multi meter. Also, sometimes my radio randomly cuts out. It has happened 3 times now, and once I could trigger it by turining on the high beams. Today I went out and put a full load on the alternator and checked all voltages with a meter and everything checked out okay. Is the alternator slowly on its way out? What could be causing this? Also I should mention in the times the radio has cut out, the lights all dim, and the voltage gauge dips way down.