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Old 07-19-2012, 09:30 PM   #15
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My MH has a RV Custom Products BCC. The isolation, emergency start, battery boost, jump? start, aux start, aux battery, call it what you want, solenoid are all the same solenoid. Depending on the battery(s) voltage, the BCC determines if and when they are connected or not connected. On mine, the engine must be off and emergency brake has to be applied for the batteries to be connected together.

Some RVs have 1, 2 or 3 disconnect and/or aux start solenoids. Norwegianlad, if you have a RV Custom BBC, this his briefly how it works. Full document at the bottom.

From the RV Custom documentation.

"Auxiliary Start and Battery Interconnect Function"

"The control electronics will make its decision on whichever of the batteries is the highest because of D1 and D2. When the highest battery voltage is below 12.6vdc, the Interconnect Relay is open. Between 12.6vdc and 13.6vdc, the Interconnect Relay stays in its prior state, either open or closed. Above 13.6vdc, the relay will pull in after a delay of about one minute. Similarly, as the batteries discharge below 12.6vdc, there is a one minute delay to turn off."

"With both batteries below 12.6vdc, the Interconnect Relay will be open. Pressing the Auxiliary Start Switch at the operator’s console will immediately pull in the Interconnect Relay"


Complete Document

RV Custom Products Schematic & Guide.doc
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Old 07-19-2012, 10:52 PM   #16
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Quote:
I was wondering about that. But if that happens does the solenoid still give the usual big clicking sound?

Mine sounds normal, in fact possibly even louder than normal.
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The clicking sound is an indication of nothing. My solenoid failed three times and the clicking never changed.
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Old 07-20-2012, 12:10 PM   #17
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My RV also has a RV Custom Products BCC which I replaced because it was very corroded. Since I removed the BCC I replaced the solenoid as well. It used to click when I removed or connected the battery cables. Of course it also wasn't working. It doesn't make a sound now and still doesn't work. Since this is my first RV I will eventually be selling it to move up. I don't want the person that will buy this to encounter any problems. I can wire a house but 12 volt baffles me. Thanks to everyone helping me solve this mystery.

Rick
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Old 07-20-2012, 02:19 PM   #18
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You should get 12+ volts to the yellow wire going to the solenoid to activate it. Have someone press the aux, jump, emergency, boost, switch and see if you get the voltage on the yellow wire. If not, your BCC is not working right or the switch is broke.
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Old 07-20-2012, 09:23 PM   #19
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The fact that the solenoid is clicking is proof that power is being sent through that middle wire.
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