Is your car or truck coming down with a case of dim headlights? One of the most common things to cause dim headlights is a bad ground. You'll
most likely have to get under the hood and track down the bad wire. The easiest way to test if a bad ground wire is causing the problem is running a piece of
wire directly from the ground plug of the headlight to a piece of metal on the vehicle. The light should immediately brighten up. If it does, you know
for sure that a bad ground is the cause of your dim headlights problem. To repair, either reconnect the ground wire securely or run a new ground wire to
your headlights. You may also try wiggling the light plug to make sure corrosion isn't causing the dim headlights.