Low beams headlights not working

[Mortdd]

What happens when your RV place can't find the issue after hours of looking? High beams work, low beams do not. The high/low beam switch has been checked, the lights have been checked by a direct connect and they work etc.

[bsinmich]

When did headlights start using fuses? I thought circuit breakers were used to eliminate the total darkness of a blown fuse.

[enblethen]

Some a double pole double throw relays. In the relaxed mode it is low beam, when energized it is high beam.
Donfrump:
Headlight fuses in the under-hood fuse panel?

[tderonne]

Daytime Running Lights don't work either I assume? If that's the case, it pretty much has to be the low beam fuses. Odd, but not impossible.

[donfrump]

Iam not sure on a F53 if the relay is used on low beam? its used on high beam

also there may be two low beam 10 amp fuses I would doubt both would blow at the same time

The headlamp switch on the F-Super Duty Class A
Motor Home Chassis (F53) utilizes one 20 amp fuse for
the headlamp high beam circuit and two 10 amp fuses
for low beam.

[enblethen]

I would try operating the dimmer switch and listen for the relay. Dimmer switch part of the turn signal lever?
Is your rig on a Ford chassis?

[Blackdiamond]

I have the same issue , I have not traced it down yet but I believe it is a bad switch or relay.

[donfrump]

Ava wrote:
I am betting the high beam switch is worn or faulty

well its the "low beams" that are out and he says High beams work, low beams do not. switch checks ok

[Ava]

I am betting the high beam switch is worn or faulty

[WyoTraveler]

Probably a bad connection. I would unplug and plug in all connectors and see if that helps.

[donn0128]

:h

[enblethen]

Ford F53 chassis? bad relay!

[donfrump]

Mortdd wrote:
What happens when your RV place can't find the issue after hours of looking? High beams work, low beams do not. The high/low beam switch has been checked, the lights have been checked by a direct connect and they work etc.

your at the wrong repair shop. Both low beams out and bulbs are good it should be very easy to trace that out very easy
the first thing once the bulbs or seal beams are confirmed good is check the Fuses!! lots of A motor homes are fused then if there good pull the main switch and check for power in/power out and and so on

[wolfe10]

What chassis?

Are the lights "fed" through a relay, or does all the current go through the head light switch?