I have a 2008 f450, it used to have factory fog lights and want to install new ones, but when i check for power at the plug for the fog lights located near the left headlight there is no power. The truck has the headlight switch with the fog lamp switch. Low beam on, switch on,...........NO POWER. Is there something I am overlooking here??

Thanks in advance

 

were the old ones working? If they were, maybe you shorted something out when you changed them.