Tip & How-To about Cars & Trucks
Fixing lights can be difficult:
You have a tail or brake light that doesn't work, but you replaced the bulb and no change. You'll have to troubleshoot, so buy a simple volt/ohm meter.
Be sure the power is off and no power on any of the socket pins. Then clean the light socket and connection pins with a stiff brush or steel wool.
First, measure all the light socket pins for power. If you don't see any voltage, must be a fuse out or a broken wire or you aren't getting a good solid ground reference.
Turn power off and make sure the socket ground is really ground by using the ohmmeter between the socket ground and a known good ground. If the ohmmeter reading is 1 or 2 ohms the socket is probably good. If the ohmmeter measures higher, then the ground connection is bad or ground wire is broken. Try to trace the ground wire, run your own wire if you have to.
Once the the socket ground measures ok, then you have to determine which hot pin is bad.
There are two hot pins, one for each filament, tail and stop light.
Pick one and measure the voltage referenced to the, now good, socket ground.
You should have power now, so try a bulb in the socket.
This Tip still in work.
Posted by danoyachtc... on
Jan 19, 2013 | 1998 Buick Century
Aug 05, 2012 | 2000 Ford Expedition
Jul 02, 2011 | 2006 Hyundai Sonata
Dec 28, 2010 | 2005 Jeep Liberty
Nov 07, 2008 | 2003 Chevrolet Cavalier
177 people viewed this tip
Usually answered in minutes!