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Fog Light on 1999 Cadillac Escalade

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changed right side fog light bulb but still doesn't light but leftt side fog light does. what is typical for me to check next and how so I do not go crazy checking the wrong thing. Figure I will use a volt meter to see if these is power there but if not is it typical for light socket to fail before I waste time changing the socket
(1) Answer
Check for power and ground at the light socket. If there's no ground, trace the wiring to the ground point. If there's no power at the socket, trace the wiring back to the source. If there's power and ground at the wires and not in the socket, the socket's no good. That's about all of it. No secrets about the Escalade, this is basic stuff. Oh yeah, be sure the bulb's good, check it for sure.