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Old 11-07-2018, 12:49 AM   #1
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Unknown 12v problem

Hi !

First i've been getting lot of info from here, thanks to all of you.

I'm having a problem and can't solve it

my 2006 damon daybreak is having this problem

alternator not charging home battery
shore or genset not charging chassis battery

aux start not connecting both batteries

i noticed it because i forgot headlights on at gas station and spent a bit f time there, met a friend and talked... generator was running and when i decided to leave the motor won't start. chassis was 11,9v and there was just missing a bit to start

home batts were full and gen still running

i tried aux start but finally had to get under the hood and jump batteries with a jumper between the 2 solenoids and got home

i changed the solenoid, same problem

here are my readings on the solenoid

shore power
chassis - coil1 coil2 - home
13v 5.6v 5.6v 13.5v
shore+aux start switch
13v 13,5 12.8 13.5

and its the same things when batts are around 12.5 12.3 v

when i unplug coil cables and put 12v on it, solenoid closes ans batteries are connected

is the bird part of my bcc dead

if so, is it repairable or must change board ?

sorry for my english, i usually speak french and rv words a new for me

thanks for your input

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Old 11-07-2018, 06:42 AM   #2
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Sounds like your relay is not closing. You might check the ground connections as this could do it too.
That relay is supposed to close any time the voltage gets over I think 13.4v It closes with the engine running to charge the house batteries and from the charger to charge the chassis batteries. It also closes when you push the button.

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Old 11-08-2018, 08:03 AM   #3
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A lot of rv gensets don't have a charge winding. They power the converter with 110V and charge the house batteries that way. The chassis or starting battery is charge via the alternator. There is usually emergency jump switch to jump the engine off with the house battery.
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Old 11-08-2018, 08:15 AM   #4
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It sounds like a BCC control board problem. Whether or not the board is repairable depends on who you know that might repair it. If there is a maker name and model number on the board try a www search. If you are lucky you will find a source or at least a schematic. If you get to the circuit board post a picture and someone might recognize it and offer more information.
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Old 11-08-2018, 08:25 PM   #5
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thanks !

will try to picture it sunday

it was ok before, so i know mine was equipped with that feature
and my switch does nothing

ill get my pc board out and check components on it

the board had a hard time, oxydation is visible
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Old 11-08-2018, 08:31 PM   #6
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i found this one, mine is like that but don't have the yellow wire
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Old 11-08-2018, 11:55 PM   #7
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Try this web page http://www.mikerobotics.com/Intellit...5322119100.pdf
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Old 11-09-2018, 12:18 AM   #8
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This will give you the part number of the whole BCC http://www.mikerobotics.com/Intellit...300635.000.pdf

Hope all this helps. I had a problem close to what you are talking about. We were camping out on a cold night (17 degrees) and winds blowing aroung 35 MPH. Long story, anyway, got ready to leave the next morning, and engine would not start. I had been on shore power all night, unplugged, and started the generator. But, when I tried to start the main engine, the battery was to low to even turn the engine over. I tried to use the emergency jump switch, but nothing. Ended up calling a friend to come give me a jump. Engine started fine, we drove home. Next warm day, I started looking around on the BCC, and found the 5 amp fuse blown on the BCC . Replaced, end of story. I have no idea what caused it to blow. Good luck, and let us know what you find, so other can gain knowledge from your particular problem.
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Old 11-09-2018, 06:19 AM   #9
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You can save some money and work by installing one of these to the large terminals of the boost solenoid.


Use 2 short proper gauge wires, and add a ground wire. Bi-directional charging restored.Click image for larger version

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Old 11-09-2018, 09:38 AM   #10
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Thanks a lot !

Will clean these cables, take time to see if everything is correct as per.the service manual posted up here

Maybe i'll get to it !

If not, your cyrix battery combiner seems a really great option over replacing the bcc or bcc board wich seems difficult to find and costly since everything else works good

Thank you very much, ill get back as soon as i solve this (hope i won't get back with a new trouble)

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