Have a light on in the upper right hand side of dash with and arow throw it 2002 ford f250

There are 2 fuse panels on your truck. i will assume you checked the fuses under your dash.. you need to check the fuse panel in the engine compartment on the left side near the fire wall. There are relays and fuses in there... Pretty sure you just blew a fuse! dont forget to check the larger feed fuses too.

The Security Module is located under the Dash. It is a Black and White Box with a White Sticker on it with Large and Small Letters.

It is under the DRIVERS SIDE...

That is the light to let you know the glow plug heater is on. If that light comes on you should wait until the light goes out before starting the vehicle.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

are the tires wearing uneven? sounds like a bad tie rod or drag link. jack up left or right side in the front just enough to get wheel off ground. Try to left from right with the wheel(with ur hands at the 3 and 9 clock postion)do you have alot of play?

okay, this should help you:
Firing Orders; (4.6L - 5.4L)
Firewall
(Passenger Side) 4 * 8 (Drivers Side)
(Passenger Side) 3 * 7 (Drivers Side)
(Passenger Side) 2 * 6 (Drivers Side)
(Passenger Side) 1 * 5 (Drivers Side)
Radiator
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Ford 4.6L Engine
Firing Order: 1-3-7-2-6-5-4-8
Distributorless ignition system
Ford 5.4L Engine
Firing Order: 1-3-7-2-6-5-4-8
Distributorless ignition system
(One coil on each cylinder)

That light indicates that it is time to replace your air filter. After replacing the filter you will want to reset the lamp. On the air filter housing is a filter indicator. It is a small (2" round) cylinder with red, yellow and blue colors on it, as well as 2 wires. Push in the rubber yellow cap on top of the cylinder until you feel a snap and see the yellow plunger in the cylinder move. This should reset the light.
I hope this helps

Hi Ag915,
The interior fuse box is under the left side of the dash. There is a cover you need to remove the gain access,it is right at the drivers knees. I hope this helps.If you need anything else,let me know. Thanks,Chuck

may have a bad relay or a bad selector switch, your going to have to replace relay first and then go from there, good luck.

change the fan resistor,its under passenger dash,very cheap to buy and fit in 20mins.open your dash and press 2 side in to let dash door drop down.you,ll see it on left hand side on a left hand drive car and right side on a right hand drive.it contols the fan speeds.just release wire block,undo screw,take out and put new one in.normaly white or blue in colour.hope this helps

Facing fuse box, left hand side, bottom fuse