98 Ford F-150 power windows,wipers don't work.

Hello. It seems your Ford has a faulty master switch in the door panels (for the windows), a faulty door jamb switches (for the dome light), a malfunctioning multifunction switch (for the turn signal/windshield wipers). Good luck and keep me informed; if you want to.

the wiper fuses / relays are in the top left of the fusebox

Sounds like a main fuse or faulty connection somewhere near your BCM. I would start by checking your large fuses.

REMOVAL

1. Raise and support the hood.
2. Remove the windshield wiper pivot arms.
3. Remove the cowl top vent panels.

1. Disconnect the windshield wiper mounting arm and pivot shaft.

1. Remove the access cover from the dash panel.
2. Remove the mounting arm and pivot shaft retaining clip.
3. Disconnect the windshield wiper mounting arm and pivot shaft from the windshield wiper motor.

1. Remove the windshield wiper motor.

1. Disconnect the electrical connector.
2. Remove the three bolts.
3. Remove the windshield wiper motor.

INSTALLATION

1. Install the mounting arm and pivot shaft retaining clip on the windshield wiper mounting arm and pivot shaft.

1. Install the windshield wiper motor.

1. Place the windshield wiper motor in the dash panel.
2. Install the three retaining bolts.
3. Reconnect the electrical connector.

1. Reconnect the windshield wiper mounting arm and pivot shaft.

1. Press on the windshield wiper mounting arm and pivot shaft after it is aligned with the windshield wiper motor.
2. Install the access cover in the dash panel.

1. Install the cowl top vent panels.
2. Install the windshield wiper pivot arms.
3. Adjust the windshield wiper pivot arms.

This is technically for the V6 4.2L but I'm sure those Ford E250's have the same setup for windshield wiper motor. Let me know how it goes.

Try replacing relay for wiper with another same relay from fuse block from another working accessory.Had same issue on friends Ford Ranger. Moved relays and cleaned harness connection at fuse block. Works fine.

This sound like some type of relay switch failure in the fuse box, you need check all the fuses and see if they're all intact and make sure none of them are burned out. If all these are not working you have a live wire some where in you wire harness

You need to check your Fuses.. It sounds like you blew a fuse that controls Those Items..

replace the dome fuse.

The Generic electronic Module controls the windshield wipers, this system controls all the electrical items like windows door ajar warning and so on. You need to have the GEM quick tested to determine the area to look for the fault, it is very rare for the GEM to fail, the most ccommon cause is the W/S wiper switch, and next the motor's internal contacts that switch it on, or the motor itself, get the Generic Electronic Module (GEM) tested with a scanner and then get back to me with the fault codes, if I was to guess a part it would be the wiper switch it is fairly expensive so it's better to test first then replace parts after pin-point tests of components and wiring are complete and you can be sure with little room for error what is causing the problem.

computer problem?