Ed-Dans

Thanks Tom.

Tom, thanks for the comments.  Everything was off but not unplugged.   I believe everything was rated at 20 amps but I'll recheck.  It was at least 100 feet of extension cord and it was on a GFCI outlet.  How does the GFCI affect it?

Harry, thanks for the great information and photos.  No, I did not find any foreign objects.  The coach was not being used.  The chassis batteries had gone bad and were replaced.  The water level was low in the house batteries, 4 deep cycle 6v, and I added distilled water.  The coach was plugged in to 20 amp service with a long extension cord in an effort to keep the batteries charged.  I wondering if I did something wrong or if I need to look for a short somewhere in the coach.  

Thank you for the great information.  My plan is to repair it myself and then have a qualified technician/electrician troubleshoot the issue.  One quick question, what would cause a physical short from the house power to the ground lug?   (i.e. bad house batteries) Again, I am a novice so any information is helpful.  

Here is the burnt acrylic panel that the circuit board attaches to.  Does anyone know where I can find one?

IMG_6641.HEIC IMG_6642.HEIC

The fire originated on this board.  I believe it connects to the alternator, front electrical panel, house fuse panel, and battery isolator relay.

I have attached more photos of the burnt circuit board, burnt acrylic board, electrical panel box, and manuel.  Thanks for the help.

IMG_6634.HEIC IMG_6635.HEIC IMG_6636.HEIC IMG_6637.HEIC IMG_6638.HEIC IMG_6639.HEIC IMG_6640.HEIC

Thanks, that helps.  I appreciate it.

I have a 2012 Monaco Knight 40PDQ.  This is my first motor coach and I am way over my head.  Any help will be appreciated.  I had a fire in the rear electrical circuit board located in the box above the chassis batteries.  The box contains the battery cutoff switches and battery relay.  

My questions are:  

1)  What is the purpose of this circuit board? ( I did find a replacement on line. )

2) Any ideas on what may have caused the fire?  The coach was not being used and I had it plugged up to 20 amp extensive cord to try and maintain the batteries.

3) There is an acrylic panel that the circuit board attaches to which also melted.  I assume it is some type of insulator.  It needs to be replaced.  

     Any ideas on where I could find one?

Again, any help is greatly appreciated. A circuit board image is attached. 

IMG_6630.HEIC