The other day both of my factory foglights quit working on my 02 F150. From looking at the owners manual i can only find 2 fuses and a relay that say anything about foglights. One of the fuses is under the dash, the other in the power distribution box along with the relay. I checked both of the fuses and they are both fine. How can you tell if a relay is bad? It seems very strange for both of the lights to go out at once.

 

You might pull the bulbs and check if they are burnt, it happend to my wife's old Grand Am. Both bulbs went oul at the same time.

 

Relays are cheap....real cheap...like $5. Get a new one and replace. Those type of relays are usable in more than one place so if it doesn't fix it then you have a spare.

If that doesnt work, then swing by a dealer and ask them to "try" a new MF switch. If it works, then pay for the switch. If it doesn't...give it back. I have had to do that before to see what was broke before buying alot of un-needed parts. Just make sure to have it ready to unplug before you go.

 

You can return electronic parts? Many places won't allow that. Check before you buy.

 

Thats why i said to ask about "checking it out", (without even leaving the lot.) Not every one will let you do this but I did find a dealer near work that doesn't mind since the parts counter is at the door and you can see the truck pretty easy. At least for the easy plug n go parts.