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Old 09-21-2017, 07:38 AM   #1
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Charging Batteries

Quick question that may be an easy answer. Does engine alternator also charge coach battery when traveling? On the flip side does shore power/gen also keep engine battery charged when parked?
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Old 09-21-2017, 07:54 AM   #2
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Running the motor does charge the coach batteries however, running the generator or being plugged in does not charge the chassis batteries. At least this is true for a 2012 Greyhawk but seems to be pretty standard across class C’s.
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Old 09-21-2017, 01:40 PM   #3
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Running the motor does charge the coach batteries however, running the generator or being plugged in does not charge the chassis batteries. At least this is true for a 2012 Greyhawk but seems to be pretty standard across class Cís.
also true for my 2016 Greyhawk.

found this out when I went out to our Plugged In RV and the chassis battery was dead.

Dead Coach battery - start the Ford engine and it'll recharge.
Dead Chassis battery - push the emergency start button to start the engine
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Old 09-21-2017, 02:39 PM   #4
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There are devices that can be installed to rectify that situation, allowing the converter to also charge the chassis battery or batteries. I am lucky, my Seneca does charge my chassis batteries when I have 110-volts available.

One aftermarket example: https://www.rvupgradestore.com/Ultra...-p/tls-oem.htm
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Old 09-21-2017, 05:53 PM   #5
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There are devices that can be installed to rectify that situation, allowing the converter to also charge the chassis battery or batteries. I am lucky, my Seneca does charge my chassis batteries when I have 110-volts available.

One aftermarket example: https://www.rvupgradestore.com/Ultra...-p/tls-oem.htm
How do you know that you are charging the chassis battery on 110? Is there a way for me to verify if mine is doing the same?

Thanks
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Old 09-21-2017, 06:12 PM   #6
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How do you know that you are charging the chassis battery on 110? Is there a way for me to verify if mine is doing the same?

Thanks
You can put a voltmeter on the chassis batteries, but in our Senecas they are not that easy to access. You may not see an immediate increase in voltage when you hook up to AC power, but over time the voltage should be maintained. The device that is installed in mine to provide this functionality is described here: http://www.precisioncircuitsinc.com/...nager-RevF.pdf

I can easily see both my coach and chassis battery's voltage in my Onan Energy Command 30 control panel by cycling through its readings, but my understanding is they don't use the same generator control panel on newer Senecas.

A work-around might be a cigarette lighter plug-in voltmeter like below, plugged into a cab dash outlet: https://www.amazon.com/Battery-Elect.../dp/B00AQAQIGO
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Old 09-22-2017, 04:10 PM   #7
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Would the scan gauge show this if the key is in the auxiliary position? I have a scan gauge but really haven't done much with it. I know it show voltage when the engine is on....


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Old 09-22-2017, 06:17 PM   #8
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Every one seems to agree on the fact that the alternator charges the coach battery. How does the alternator do this and how do you troubleshoot the circuit when it fails?

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Old 09-22-2017, 08:36 PM   #9
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Don't know if my Granite Ridge is special or what..... But have the coach power hooked up to 110 whenever we are not travelling(more often than I like)
The coach and E450 batteries are always at 12.9V, which definitely tells me it charges both 12V systems
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Old 09-23-2017, 08:13 AM   #10
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Would the scan gauge show this if the key is in the auxiliary position? I have a scan gauge but really haven't done much with it. I know it show voltage when the engine is on....


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I am plugged in to 50 amps and just checked my ScanGauge with the engine off. The voltage on the Scan Gauge reads 12.7 volts. The inverter panel is showing 13.5 volts.

This indicates to me that the house batteries are being charged while the chassis batteries are not.
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