I'm Chris, Thanks for allowing me to help you here on Just Answer.
To route wires from the seat to under the dash you need to remove the seat. Do this by unplugging all the electrical connections under the seat then remove the 4 nuts/bolts holding the seat frame to the floor. Then remove the door sill plate (this is the plastic cover which is the first thing you step on when you enter the vehicle) Its held down by push clips which you just pry up on to remove. Now route your wire under the carpet and along this sill plate and in behind the kickpanel to the fuse panel
If you choose to do it this way then yes you stick both wires in beside the fuse. I dont know whom told you to use fuse 2 because this is not a switched fuse. Its hot all the time.
Since your seat heater has its on fuse and on/off switch then it really needs to go to the battery. Anytime you steal power from another circuit you risk the chance of overloading that circuit and blowing that fuse or damageing the fuse panel.
I only provided methods to hook it up to a fuse since that what you asked for, but I feel it would be a better choice going to the battery.
I dont have this car currently in my driveway right now so I cant verify myself, but when I login to the ford website and pull up the wire diagram its shows fuse 2 under the dash hot at all times so this is no one bit different than hooking it to the battery.
You can get back to me anytime simply by logging in and replying.
You should not be wiring anything into the current fuse panels at all. All these circuits are called for. If you add 20 amps on any of them you can suffer burnt up wires (fire)
To wire in a remote relay you nust first off buy a relay. A relay needs power from the battery and power from the ignition switch in the steering column. Then you need a ground and a wire going out to your products. The ignition turns on and then energizes a relay. The relay closes and allows battery voltage to flow through to your components. The relay will only be on when the key is on.
The factory heated seats use a module to turn the heat on and off.
The empty slots on the back of the interior fuse panel are not even wired up.
The factory seat heater uses no relays at all. It always has power. The module the seat heater uses, uses another circuit to tell if the car is on or off to allow for seat heating or not as well as the climate control system.
Those empty relay holes in the back of the fuse panel have no power or wires to them. You would have to build your own fuse box to use them (pain in the butt)
If you want a switched circuit meaning you only want it to have power when the key is on then you must go with a relay. You can go from a fuse which is switched or to the ignition switch.
Here is how a relay works shown below. If you go a parts store they should be able to help you because off road lights or winches etc... all need relays. A relay is just a switch which can carry alot of voltage and hold up to voltage being turned on and off immediatly. Imagine your breakers in home breaker box as the relays and your wall switch as a switch. A switch can handle all that power at once being turned on or off, it would burn up the contacts. But a breaker can.
Not hard at all, remove the lower steering column shroud and splice into this wire.
I am not familiar with the notations in these scematics.
16 14 RD/LG
I don't know what the 16 is. I assume 14 RD/LG is 14 gauge, Red / what is LG?
Thanks Moose, I will work on it tomorrow and let you know how it goes.
I guess my first stop will be at the auto parts store to pick up a relay and some wire.
They didn't mention this stuff when I studied the literature before buying the seat heater.
Thanks for your help.
See if this helps.
As for your seat heaters not getting hot I cant help there. You may want to plug one straight up to the battery and see if it gets hot. Dont expect them to get like 200 degrees. There only supposed to get up to like 120 if there like the factory ones. 120 is barely felt by bare hands.
Glad I could help on getting the power to the seats, you can add a bonus if you would still like to do once you hit accept.
Glad you got it done, you will now have a happier wife, and thats priceless and a must.
Happy new year.