Underhood fuses 11 Expedition

[fafinsab]

Before I start pulling every fuse and checking does anyone know which if any fuses in the underhood box are ignition switched? I installed a relay for my air horns and want to use a swiched source so it does not work when the car is off.

 

[Thermo]

fafinsab, why pull the fuses. If you look at the top of the fuses, you will see 2 small metal posts. Take a multimeter, find a good ground on the truck, attach the black lead to the ground point and then touch the metal post on each of the fuses with red lead (make sure the multimeter is set to VDC). With the truck off, the fuses with power are powered off of the battery. All the others are your switched power sources.

Enjoy.