Yes you can
Mini fuse ( # 17 ) is a 15 amp fuse for the foglights in a 2003 Lincoln Navigator
A passive subwoofer doesn't have a built-in amp and will require the use of an amp.
Turn the vehicle on then look into the exhaust for 5 minutes
On a 2003 Lincoln Navigator : ( mini fuse # 41 is a 20 amp fuse for the cigarette lighter and OBD II diagnostic connector )
According to the 2006 Lincoln Navigator owners manual : ( fuse # 41 is a 20 amp fuse for the cigarette lighter and OBD II diagnostic connector )
According to the 2001 Lincoln Navigator Owner Guide : In the power distribution box ( which is " live " ) located in the engine compartment on the drivers side ( fuse # 23 is a 15 amp fuse for the HEGO sensors , canister vent , transmission , and CMS sensor ) * HEGO stands for Heated Exhaust Gas Oxygen sensor *
Mini fuse # 41 is a 20 amp fuse for the OBD II diagnostic connector and the cigarette lighter according to the 2004 Lincoln Navigator Owner Guide
An active subwoofer has a built-in amp which doesn't require the use of an amplifier.
You can get an 18" Pyle subwoofer but you will also need a large amp for it.
Where is the fuse for the amp