BAC Forum
General Boards => Technical Support => Topic started by: Preston Nash on August 04, 2025, 05:44:52 PM
-
My 99 Marquis lost power to the entry step and the vent fan for the engine compartment. I've never understood the DC circuit protection on the coach and I can't find the answers in a search. I have looked through coach assist, etc. I've never seen any typical automotive type fuses on the coach anywhere. I see the bus bars in the electrical bay along with several relays. There is an amperage rating listed on the individual connections, but I don't see what I identify as any breakers. Where is the DC circuit protection and how do you reset it? It's a rookie question I know, but please help.
-
Look in the back closet with the AC breakers.
-
None of those are tripped and nothing is labeled entry steps.
-
On my coach you have to take out a screw that holds on a metal plate. The 12 volt fuses are behind the plate and beside the 120 volt breakers.
-
Thanks. The coach is 20 minutes away, so I’ll have to wait until I can get over there to explore further. I do have the panel of DC breakers above the bed. Appreciate the responses.
-
In case it helps someone in the future, even though none of the DC breakers above the bed were visibly tripped and none of them are labeled anything associated with entry steps, I cycled all of the breakers and it works now. I guess a breaker can be tripped and still be fully in the on position?
Thanks for input.
-
Preston,
Now I am a little confused, at least on my coach the breakers that you can flip are AC 120 volt breakers. The DC fuses are all blade type fuses that can be visibly inspected to see if they have blown. Also my steps are powered by 12 volts DC to the breakers would have no effect on the stairs.
Do you have resetable DC breakers?
-
I have two panels above the bed. One is the typical AC panel. To the right of that is another panel with a master switch and then probably 15 or so switches in a vertical row for the various DC equipment. The DC switches appear to be just ON/OFF switches and look similar to an old school light switch. There doesn't appear to be a middle position where the switch would go if it were tripped like an AC breaker has. I share your confusion. That's what lead me to ask the original question. It didn't appear to me these DC switches are breakers. When I cycled them, it did remedy the problem but I am still unsure about the whole thing.
-
Can you post a picture it might be helpful in identifying your situation.
-
I have cycled breakers/ON-OFF switches, both 12v and 120v, that appeared or not appeared to have been kicked out, and was successful in getting equipment to operate again. It could also be that cycling a breaker/ON-OFF switch will cause a reset in the malfunctioning equipment.