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Old 03-09-2016, 10:31 PM   #1
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Battery isolator question

This is for a 2016 Forester. The battery isolator has one side connected to the house batteries and the other to the chassis battery. If you press the emergency start switch the isolator opens allowing vehicle to start from house batteries.
Now when you are plugged into shore power does the isolator open and allow the converter to also charge the chassis battery? I am wondering if I should invest in a Trik-L-Start.

2016 Forester GTS 2801QSF
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Old 03-09-2016, 10:39 PM   #2
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On most rigs that I have seen the converter does not charge the chassis battery only the coach batteries. With my Winnebago I leave a battery tender on the chassis battery when I have the rig in my shop.
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Old 03-09-2016, 10:51 PM   #3
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Not to be a smart ass, but the isolator switch stays in the open position until called upon. My 2016 Forester (MBS) has an isolator switch that closes when the engine runs so chassis and coach batteries charge. It does not close when plugged into shore power, so it does not charge the chassis battery. I installed a push button switch so I could turn on the isolator switch if I needed it to jump my engine. Mine did not have one from the factory.
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Old 03-10-2016, 02:27 AM   #4
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Does anyone have a Trik-L-Start? Opinions? It allows a trickle charge to chassis battery from your house batteries via converter.
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Old 03-10-2016, 08:45 AM   #5
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Most BCCs are designed to work both ways. If yours doesn't I would try to figure out why not. The trik-l-start appears to lose at least .5 volts, the BCC isolator solenoid will lose you nothing. It is already there and can do the job if correctly hooked up.
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Old 03-10-2016, 09:02 AM   #6
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Gonna do some testing and check some readings today
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Old 03-10-2016, 10:07 AM   #7
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Originally Posted by sgtlm17 View Post
Gonna do some testing and check some readings today
I looked at the manual for the Intellitec BCC. Seems that it would be hard to prevent the converter from charging the chassis battery without going to great lengths as the circuitry that allows the house to be charged by the engine is integral to that function. There are some fuses that might be a problem and I did notice a "removable jumper" on the ignition isolation relay that prevents shutting off the batteries when the alternator is running, which would blow the diodes in the alternator as it would no longer see a load.

Here is what I am looking at.

http://www.intellitec.com/assets/pdf/5301087new3.pdf
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Old 03-10-2016, 11:48 AM   #8
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I checked the jump connections under the hood. The voltage did not change when I turned on shore power. I have to assume it does not charge the coach battery...although I could be wrong
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Old 03-10-2016, 03:45 PM   #9
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Bob dirt,

I think the poster's 2801 QSF is on a Ford chassis. The BCC operates a little differently from the BCC on a MB. I recall Brian Clemens said MB would not let them connect to their electrical system. On the Ford chassis the BCC connects the coach and chassis 12 volt system when the coach's convertor is charging, when the chassis alternator is charging, and when the battery booster switch is pressed. The BCC will connect the batteries only if there is enough voltage, unless the booster switch is pressed. If the coach batteries are low, it won't connect until the convertor has charged them.
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Old 03-10-2016, 03:54 PM   #10
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Bob dirt,

I think the poster's 2801 QSF is on a Ford chassis. The BCC operates a little differently from the BCC on a MB. I recall Brian Clemens said MB would not let them connect to their electrical system. On the Ford chassis the BCC connects the coach and chassis 12 volt system when the coach's convertor is charging, when the chassis alternator is charging, and when the battery booster switch is pressed. The BCC will connect the batteries only if there is enough voltage, unless the booster switch is pressed. If the coach batteries are low, it won't connect until the convertor has charged them.
I did see he had a different chassis, that's why I wrote "on my chassis".

The way to verify charging is with a DC volt meter. The voltage should go up on the coach battery connections when he turns on shore power. If it does not, it does not charge on shore power. I kinda wish mine did.
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