I have an 03 Tahoe Z71 and just recently installed a few LED lights, 4 in total. I ran two of them on one harness, and the other two on separate harnesses for a total of 3 harnesses. I ran all three to the battery and after driving for about 30 minutes, the "Battery not charging" and "service brake booster" messages intermittently came off and on for the whole drive. Once in awhile it would go back to normal but wouldn't last more than a few minutes. My voltage dropped from 14 to about 12 and slowly just went lower and lower until the battery died. I'm not sure if the battery has been replaced or if the alternator has been replaced but before I change those, I want to see if there is a different solution. I read through other posts but couldn't find much on my specific issue. I don't know much about electrical so that's why I'm asking. Any help would be appreciated. Thanks!