Fog Light Electrical Gremlins Troubleshooting and Resolving Shorts

all the F series trucks gonna be like this. 2 50 up. first thing we're going to do is remove the grill. I have a short video out on how to ... Check polarity. LED's are picky. If they're hooked up backwards, they won't light. Touch P2 and have someone turn Fog on/off and see if you can feel it "click". If so, then the relay is good and either the bulbs burned out or ... There's something wrong in the wiring/switch/bulb. I'd check behind the fog lights first, and look for obvious exposed/chaffed wiring. I think you most likely just have a burnt out bulb which is easy to replace from under the front of the truck. If you have a 12 volt test light ... If it's not the fuse it could be the relay or foglight switch control module. ... If that's doesn't work, you might have to replace your foglight ... If the fuse is blown, I would swap it with like fuse and recheck the lights. Just me. If all the obvious have been covered, then you'll have to ... Most likely the multi function switch has gone bad, very common. Pull the fog light relay to kill the fogs and go find a new switch. Someone ... Your best, safest, most reliable current-tapping bet is to tap the battery or alternator directly, or to run a separate fuse/relay off the ... Something in addition to your foglight bulb filaments is closing (i.e. connecting) the circuit between battery positive and ground. If your ...