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mxw1 11-14-2016 12:14 PM

Where is the battery disconnect relay ?
I have a 2004 34 foot national sea breeze.
I,m trying to find the physical location of the house battery disconnect relay.
It,s the relay that you can hear when energized or de-energized by the disconnect rocker switch near the entrance door to the coach. It shuts off the 12 VDC power to most of the coach when in the off position.

It,s not the relay that you hear when connecting or disconnecting to shore power, that would be the 120VAC disconnect or transfer relay.



c92vette 11-14-2016 05:23 PM

1 Attachment(s)

Look around the front of the coach for a black box, the Battery Control Center or BCC, that looks somewhat like the attached picture. Inside you will find all of the coach side power items such as fuses, relays, and the disconnect relay.

Attachment 144386

mxw1 11-14-2016 05:24 PM

I believe I found it...located in the 12vdc distribution panel area in the storage bin below the passenger seat. It looks like an old Ford starter solenoid, it is mounted below the board that has circuit breakers marked as J-5 through J-11.

answered my own question...


Bill WA6YBD 11-14-2016 05:54 PM


Yes it looks like an old Ford started solenoid. And the 2 are very similar and they are available at auto parts stores. However there is a difference in the way they are made. Be sure the solenoid you purchase is a constant use solenoid and not a starter solenoid. It should state constant use on the box. I forget if it is a 3 wire or 4 wire unit be sure to check one that is currently installed.


Richard S. 11-14-2016 06:31 PM

That one is the interconnect solenoid. The disconnect or latching solenoid is a black plastic box next to it on the right side.


mxw1 11-14-2016 08:23 PM

I see both, the disconnect relay, ( which requires no power in ON or OFF state, only to change the state; latching relay ) this is what connects the coach battery to various 12 volt loads and the other relay that looks like a FORD starter relay is the "Interconnect Relay".
This Ford looking,Interconnect Relay is only energized when you want to connect the chassis battery to the coach battery? Like if you run down the chassis battery and don't have enough battery power to start the engine?
Does this relay get energized after the engine starts and alternator output is above the coach battery voltage, when energized allows the alternator to charge the coach battery as well as the chassis battery, which is always connected to the alternator?
Hope I'm understanding the reasons and components.
Thanks for your replies,


Bill WA6YBD 11-15-2016 06:41 AM

WOW! Sorry about that, I really need to read the original post correctly. It is the latching relay you are after. They are not available at auto stores.

Here is another model. This model was in my 95 Dolphin. I was able to take it apart and repair the toggle mechanisem and clean the contacts and it worked like new. Depending on elecrtical requirements National used both types.

Intellitec Battery Disconnect Relay-Prevents Dead


mxw1 11-15-2016 05:18 PM

OK Thanks,

chboone 11-15-2016 09:31 PM

1 Attachment(s)
The best thing to do is call RV Custom Products and ask for the documentation and troubleshooting guide, they will email it to you. I received 7 pages for my BCC. In the mean time I have this drawing of the BCC that uses fuses. Later ones have circuit breakers.

RV Custom Products
14000 Anson Ave, Santa Fe Springs, CA 90670
(562) 921-8353

mxw1 11-17-2016 10:43 AM


I just got off the phone and they are going to e-mail me the drawing and troubleshooting guide.
This should be a handy thing to have.


mxw1 11-18-2016 06:50 PM

I got a couple of attachments along with a troubleshooting guide from
RV Custom Products; the makers of the BDC ( Battery Distribution Center).
More info than I expected.

There is a lot of good information on the wiring diagrams listed as Figures 1, 2 &3. Has circuit breaker numbers, connector plugs numbers etc.

You might want to call them and get a copy for yourself, for future reference.


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