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Old 03-10-2016, 04:10 PM   #11
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Bob dirt,

It's your motorhome. Wire it to charge when you want it to. Use a switch. Maybe the BCC that's installed can do it like the one in Fords and you can add wires to make it work.
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Old 03-10-2016, 04:17 PM   #12
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Yup finished testing. When engine running house batteries charge. Engine off plugged Into to shore power only house batteries charge. I will probably do something to keep chassis battery up. Battery tender, Trik-L-Start, etc.
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Old 03-10-2016, 04:41 PM   #13
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Yup finished testing. When engine running house batteries charge. Engine off plugged Into to shore power only house batteries charge. I will probably do something to keep chassis battery up. Battery tender, Trik-L-Start, etc.
Do you have a Ford or Chevy chassis? I can't tell from the photo in your tag. If you have a MB chassis, ignore my comment below.

How long did you wait to read the voltage at the chassis battery after the plugging in the shore line? Our 2011 Sunseeker has an Intellitec BCC, which does not connect the coach batteries to the chassis battery until the coach system is above 13.1 volts for more than 2.5 minutes. I think FR changed suppliers, so yours may work differently, but the concept should be the same. If the coach batteries are low, it may take a while for the system to rise above 13.1 volts. If you don't have documents on your BCC, look on line for it to find out the voltages and timing for yours.

By the way
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Old 03-10-2016, 04:48 PM   #14
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Bob dirt,

It's your motorhome. Wire it to charge when you want it to. Use a switch. Maybe the BCC that's installed can do it like the one in Fords and you can add wires to make it work.
good idea...I could swap out my momentary switch I installed to a toggle switch and just be careful not to leave it on when not needed.

I'll also look into Trik-L-Start like sgtlm17 mentioned.
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Old 03-10-2016, 04:54 PM   #15
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Hmm very good info Rambler I will take another look at it
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Old 03-10-2016, 05:10 PM   #16
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Not sure either

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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
I measured the chassis battery voltage the other day at the jump start connections too - and got 13.8 volts with shore power plugged in. As a result, I assumed that the BCC relay was closed and the converter was also charging the chassis battery. Probably not a good assumption I guess.

I'm going to call Precision Circuits again tomorrow and see if I can get a better technical description of how the BCC works. Need to talk to them anyway about the fuse size for hooking up the boost/emergency start function. I assume 5 amps is more than adequate, but I'm going to verify.
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Old 03-10-2016, 08:21 PM   #17
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As to the question before my 2801 is on a 2016 Ford E450
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Old 03-10-2016, 08:36 PM   #18
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You know, that is interesting. I am building a data logger for my Trimetric that records all the parameters and writes them to an SD card for subsequent analysis and evaluation. Surprisingly, I watched the banks stay connected for quite a while after I shut down my generator (converter) or my engine (alternator.) On my older 1997 Bounder, the BCC would keeps the banks connected for a while, but the newer versions seem to keep things connected much longer.
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Old 03-10-2016, 08:37 PM   #19
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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.
Seems that I read somewhere that was a misunderstanding.
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Old 03-12-2016, 02:12 PM   #20
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Anyone get a definitive answer on this. I'm going to try to get to coach and do more testing later today
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