no low beam headlight
#1
no low beam headlight
i have a 99F-450 with no low beam. Changed out Mult function switch, Headlight switch and bulbs, High beam works when MFS is pulled back. Fuses are good because when high beam is on i checked with test light, lights up but when low beams are on, no power to fuses. Any help would be nice
#2
Isn't there a relay in the headlight circuit? You didn't mention checking it. There is one place to look.
This thread has some other areas to check if the relay is OK.
https://www.ford-trucks.com/forums/1...t-working.html
This thread has some other areas to check if the relay is OK.
https://www.ford-trucks.com/forums/1...t-working.html
#5
I'm just guessing, since the 450 is different than the 150 and 250 I have.
I downloaded the owners manual for your year and model, and did not see any mention of a relay, except for daytime running lights. Do you have those? (Fuse 28, DRL relay coil).
Also, the low beams are on two separate fuses, as I'm sure you know. Numbers 9 and 11 in the power distribution box under the hood near the brake master cylinder.
Have you checked them for voltage when you want the low beams on? This may help figure out if the problem is before or after the fuse.
There are some wiring diagrams for the '02 F450 that are linked from this thread:
https://www.ford-trucks.com/forums/1...-location.html
Those diagrams make it look like the headlight fuses are downstream of the multifunction switch.
I downloaded the owners manual for your year and model, and did not see any mention of a relay, except for daytime running lights. Do you have those? (Fuse 28, DRL relay coil).
Also, the low beams are on two separate fuses, as I'm sure you know. Numbers 9 and 11 in the power distribution box under the hood near the brake master cylinder.
Have you checked them for voltage when you want the low beams on? This may help figure out if the problem is before or after the fuse.
There are some wiring diagrams for the '02 F450 that are linked from this thread:
https://www.ford-trucks.com/forums/1...-location.html
Those diagrams make it look like the headlight fuses are downstream of the multifunction switch.
#6
#7
apparently I've been looking at this all wrong, I don't have high beams. Multi-function switch is in middle position, pull toward driver flash to pass, then push to ward engine high beam ( i don't have high beam indicator on cluster) so i may have the dims but not the brights. As to be something simple , but i can't see it yet.
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#8
apparently I've been looking at this all wrong, I don't have high beams. Multi-function switch is in middle position, pull toward driver flash to pass, then push to ward engine high beam ( i don't have high beam indicator on cluster) so i may have the dims but not the brights. As to be something simple , but i can't see it yet.
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Tilleyman
1948 - 1956 F1, F100 & Larger F-Series Trucks
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02-12-2016 05:48 PM