Editing How do turn signals work? (section)
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===Single lamp failures=== This is one of the most common failures found on vehicle lamp systems. The first thing to do is check the bulb. If the bulb is good, check for power at the socket. ====How to check for power at the socket:==== #Get your DVOM out, set it for volts scale, V X 50 or higher, and turn the key on then the offending signal. #Carefully insert the probe of your meter into the socket, to the contact pad (S) on the bottom of the socket, and the other to a good ground. #If you read 0, then 12 volts then 0 again (flash signal), the power to the lamps and the system are working fine. You have a bonding issue. #Shut off power to the system, and key, and return to the offending socket. New cars today have plastic bumpers and anti-collision systems. Proper ground bonding is becoming scarce compared to bygone days. Also, lighting systems have had to rely on wired or remote location grounds. It is quite common to lose ground to a single socket and disable it. Set your meter for OHMS Scale, R X 1, calibrated 000, and measure between the socket and a known good ground. Your reading here must be 000, if infinite, or random, you need to perform good bonding repairs to the socket. Using a good contact cleaner, carefully clean the socket, pads and lamp brass base and its pads. Next, recheck the socket for bonding, if your readings are still infinite or random, replace the ground wire to a known good ground area. Use a star washer and burnish all the paint and dirt from the bonding area. That will get a single lamp back to operation.
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