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Chassis Multiplex FRB Electrical Fire


Bob125
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I came across this topic by Frank McElroy and downloaded the file and write-up by Tal G.  If you search for a file called "Chassis Multiplex FRB Electrical Fire 1.0.0" you will find it.

In the write-up, Tal G. suggested to add two circuit breakers for the house and chassis battery power cables feeding the Front Run Box printed circuit board.  I am going to do that to my 2009 Beaver Marquis as I feel I have the same system and potential for fire.

I've attached a picture showing another power feed to the Chassis Control Module.  Does anyone know if I need to add a circuit breaker to this as well?

Thanks, Bob...

2009 Beaver Marquis

 

 

2009 Beaver Front Run Box.png

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I don't know what your rear run panel looks like, but in '06, Monaco fed the front run panel from the rear run panel.  All of those circuits were protected by circuit breakers.  I'm attaching a drawing I made of the rear run panel on our '06 Dynasty.  If they continued that design concept, it might help you check out to see what you have.  I will say that your front run panel bears no resemblance to ours, but that's ok.  The rear one could still be very similar.

In 2006, there were three feeds to the front run panel.  One was a chassis battery feed and it was protected by a 150 amp breaker.  One was a coach battery feed protected by a 110 amp breaker that was switchable by the "salesman switch" by your entry door.  And one was a coach battery feed protected by an 80 amp breaker that was always "hot".

Good design practices would have those feed circuits already protected by circuit breakers like the attached drawing shows, or by fuses, most likely by circuit breakers.

Layout - Rear Run Panel (Back 2).pdf.pdf

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Bob,. I was the one who worked with Tal to redesign his burned up PCB and to properly fuse each sub section feed as well as the main feed cables.

A chassis multiplex coach is a completely different system from the conventional system in older coaches.  Monaco made a mistake by not properly fusing the battery cables feeding the large PCB.  Adding the two breakers described in that file document will properly protect that PCB.

As for the large cable feeding the CCM module, that is properly protected with circuit breakers located in the RRB.

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Hi Frank, thank you so much for the confirmation.  Exactly what I needed.

I enjoyed ready Tal's write-up.  Lots of great info to further understand the system on my 09' Beaver Marquis.

I'm trying my best to have provisions for work arounds if any of the multiplex CCM items fail.

Thanks again, Bob...

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Bob, the weak link in the CCM is the +5 volt supply that feeds the smart wheel.  I've already helped quite a few members identify this as the reason why their smartwheel controls start to not work properly.  There is a $20 solution that uses a separate +5volt supply posted in one of the group discussions.  This would be high on my priority list to fix as soon as you start having wiper problems.

 

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I'm on that now.  I just received my 12V to 5V supply in from Amazon today.  I think I have identified the wiring, got the power supply and wiring and making a file on this if/when I lose power to my smart wheel.   All working good the last 11 years.  Thanks again.  I'm trying my best to be proactive and have alternate means to power headlights, wipers, turn signals if this Kongsberg CCM decides to quit working properly.  Trying not to be stranded.

Thanks for all your insight.  Bob...  '09 Beaver Marquis

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