Why is my left rear turn signal malfunctioning on my 2010 F250?
If it is just the one turn signal on one side that does not work. You need to check and/or replace the bulb. If it is not the bulb, check for corrosion in the socket and clean the contacts. Also check for a poor ground at the socket. If that does not work go through the trouble shooting guide at the link below: TROUBLESHOOTING BASIC TURN SIGNAL AND FLASHER PROBLEM http://www.procarcare.com/includes/content/resourcecenter/encyclopedi a/ch14/14TSTurnSignals.html
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