Author Topic: DC breaker reset?  (Read 11706 times)

Preston Nash

  • BAC Member
  • *
  • Posts: 32
  • Thanked: 3 times
DC breaker reset?
« 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.   
Preston Nash
99 Marquis Tourmaline, Cat C12 425hp

Frank Bergamo

  • BAC Member
  • *
  • Posts: 309
  • Thanked: 87 times
Re: DC breaker reset?
« Reply #1 on: August 04, 2025, 06:01:43 PM »
Look in the back closet with the AC breakers.
Frank & Paulette Bergamo
2018-       : 2007 Marquis Topaz IV  C-15 600 HP Allison 4000
2014-2018: 2002 Marquis Emerald C-12 505 HP Allison 4000
2004-2014: 1986 Executive Diplomat 3208 250 HP Allison MT-643
Grand Junction, CO.
The following users thanked this post: Preston Nash

Preston Nash

  • BAC Member
  • *
  • Posts: 32
  • Thanked: 3 times
Re: DC breaker reset?
« Reply #2 on: August 04, 2025, 06:46:54 PM »
None of those are tripped and nothing is labeled entry steps.
Preston Nash
99 Marquis Tourmaline, Cat C12 425hp

Carl Boger

  • BAC Member
  • *
  • Posts: 505
  • Thanked: 146 times
Re: DC breaker reset?
« Reply #3 on: August 04, 2025, 10:38:35 PM »
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.
Carl

98 Beaver Patriot Savannah
330 hp Cat 3126
The following users thanked this post: Frank Bergamo, Preston Nash

Preston Nash

  • BAC Member
  • *
  • Posts: 32
  • Thanked: 3 times
Re: DC breaker reset?
« Reply #4 on: August 05, 2025, 06:23:26 AM »
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.
Preston Nash
99 Marquis Tourmaline, Cat C12 425hp

Preston Nash

  • BAC Member
  • *
  • Posts: 32
  • Thanked: 3 times
Re: DC breaker reset?
« Reply #5 on: August 12, 2025, 01:06:50 AM »
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 Nash
99 Marquis Tourmaline, Cat C12 425hp

Carl Boger

  • BAC Member
  • *
  • Posts: 505
  • Thanked: 146 times
Re: DC breaker reset?
« Reply #6 on: August 12, 2025, 11:40:44 PM »
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?
Carl

98 Beaver Patriot Savannah
330 hp Cat 3126

Preston Nash

  • BAC Member
  • *
  • Posts: 32
  • Thanked: 3 times
Re: DC breaker reset?
« Reply #7 on: August 23, 2025, 08:26:46 PM »
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. 
Preston Nash
99 Marquis Tourmaline, Cat C12 425hp

Carl Boger

  • BAC Member
  • *
  • Posts: 505
  • Thanked: 146 times
Re: DC breaker reset?
« Reply #8 on: August 23, 2025, 11:44:20 PM »
Can you post a picture it might be helpful in identifying your situation.
Carl

98 Beaver Patriot Savannah
330 hp Cat 3126

David T. Richelderfer

  • David Richelderfer & Leslie Woodside, dogs Jasper, & JoJo
  • BAC Member
  • *
  • Posts: 1743
  • Thanked: 480 times
  • OSU, Class of 1971, OR native, RVing over 50 years
Re: DC breaker reset?
« Reply #9 on: August 24, 2025, 01:48:46 AM »
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.
2004 Beaver Marquis Sapphire

I had a dream... then I lived it!