Leaderboard

Before pulling the bulbs, you should look for a change in voltage on the meter with and without the lights/audio on. If fact, what I typically do when performing a quick test, observe the meter as you switch each component on...one by one. If the brake lights are showing a large dip on the meter or with everything on together you are dropping below 13 volts...you have a problem. It's rare, but you could have a bulb that's not lighting up and instead shorting out. If the charging system stays above 13.5 under full load than I'm leaning towards a problem with the wires coming from the battery or loose/corroded battery terminal. Most of the situations that I've worked on where there seems to be an electrical demon and all the tests are good...It's usually something like a poor body ground.