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Ford f450 running lights and taillights out

\015 I have a ford f450 2008. Neither the running lights or the taillights are working. I have checked all the possible fuses and can not seem to find the problem. Some assistance would be greatly apriciated.\015 Posted / edited by AnonymousUser on : 11-12-2017

Answers :

Assuming it is gas, not diesel and not a dually. If 15A fuse 22 in the smart junction box (SJB) is OK, power is getting to the park lamp relay. Setting the main light switch to AUTO programs the microprocessor in the SJB to close the relay and turn on the marker lamps (VIO/WHT wire) as well as the five roof marker lamps if you have them. The closed relay also turns on the park filaments of the front park/turn lamps and the rear park/stop/turn lamps (VIO/WHT wire)
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