We have a 2009 Mandalay 43A on a Freightliner chassis. The left turn signals work just fine, but no the brake lights. Speaking bulb-wise, they're the same filament so it's not a bulb issue. The right turn signals and brake lights work, too. Looking at the fuse panel there's no separate fuse for left versus right brake lights. If I activate the hazard flashers both sides flash normally. All the running lights are functioning. Just... No left brake lights. Any thoughts?Pat in Menifee, CAwww.patcarnathan.com

Have you done any work on the coach recently? I assume this is without a toad connected?

There might be a brake-light plunger switch on the brake pedal assembly.

if air brakes there is a switch in system for lites.Usually round with 2 wires mine was right by the treadle valve.mine had two of them.

It sounds like you have the wrong bulb or a broken one. Easy to test with a cheap 12 volt tester. One that lights up when it makes connection.Just ground the clip and poke the base of the bulb socket after you remove the bulb. Take the bulb out and compare it with the one that works. Look for two contacts on the base. Some systems use a seperate bulb for the brakes and some use a dual filament bulb. A dual filament is very common.

turn 4 way flasher on see if it works probably a turn signal switch problem

Turn signal but no brake | Good Sam Community

JackMS
Explorer
Oct 31, 2015
I would go with Dave's suggestion. 2 brake switches maybe. That would be a good setup as if one switch goes bad you still have at least one brake light. Could be near the brake pedal either inside or out. Or possibly if you have an electrical control center outside under drivers seat. Good luck
allbrandauto
Explorer
Oct 31, 2015
turn 4 way flasher on see if it works probably a turn signal switch problem
YC_1
Nomad
Oct 31, 2015
It sounds like you have the wrong bulb or a broken one. Easy to test with a cheap 12 volt tester. One that lights up when it makes connection.Just ground the clip and poke the base of the bulb socket after you remove the bulb.

Take the bulb out and compare it with the one that works. Look for two contacts on the base. Some systems use a seperate bulb for the brakes and some use a dual filament bulb. A dual filament is very common.
dakdave
Explorer
Oct 31, 2015
if air brakes there is a switch in system for lites.Usually round with 2 wires mine was right by the treadle valve.mine had two of them.
jerseyjim
Explorer
Oct 31, 2015
There might be a brake-light plunger switch on the brake pedal assembly.
ArchHoagland
Explorer
Oct 31, 2015
Have you done any work on the coach recently?

I assume this is without a toad connected?

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Turn signal but no brake

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