Where is the high beam relay on 1998 e350 - 2002 Ford E350

faulty relay under dash somewhere for high beams or faulty switch on steering column. relay should click on and off suspect relay stuck in high beam on most likely location of relay is under bonnet or side panel on vehicle.

high beam relay might be stuck on

Check in that fuse box again. There is one for each, the high beam and the low beam.

There is a headlight relay in the engine compartment fuse box, but its after the headlight switch and before the dimmer switch, so it powers both high and low beam circuits.
I would check the dimmer switch.

usually the headlights have a relay in a fuse box under the hood. is it just the high beams that don't work. have you tried a new bulb. sometimes they look ok but do not work. also do you hear the switch click when turning them on and is there an indicator coming on in the instrument cluster? good luck

CHECK THE DIMMER SWITCH. THE SWITCH MAY BE "STUCK IN HIGH BEAM POSITION. THE STEERING WHEEL WILL HAVE TO BE REMOVED. ANOTHER THING TO CHECK FIRST IS THE HIGH BEAM RELAY. THIS MAY BE UNDER THE HOOD IN A FUSE PANEL OR UNDER THE DASH. HOPE THIS SHEDS SOME "LIGHT" ON THE SUBJECT..lol

No the dimmer switch doesn't change high/low beams just interior lights. Did you try changing the bulbs?

Good Luck,
Subikid90

did you check for a relay in your fuse panel? there should be a relay that controls your low beams and one for your high beams. check for that and then if high beams are working swap it with low beam relay. if your problem switches to low beams working and high beams not working replace the bad relay.

hi from uk provided you have checked bulbs are ok? then this fault may be the relay for the low /dipped beam has gone faulty if you check h/book you may find location of low beam relay there is relay for high and one for low beams if you find both relays ? try switching? this will confirm relay fault if you then have low beam but no high ? b4 you buy new relay other than tis the other possible fault may be the actual di/high beam stick control ?

This could be a bad switch or the relay. I hope this helps.