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Old 10-20-2016, 06:02 PM   #1
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Converter output

2004 Winnebago Sightseer 35n.
Engine battery takes a charge, however load rest reveals bad battery. While battery was disconnected and coach on shore power the positive lead to ground revealed no voltage. Replaced battery.
My question is:
Measured converter output it is 13.7 Vdc. disconnected converter chassis ground and ground from converter to bus ground, and positive connection from converter to coach. Are there any component's in the chassis electrical box that is in the right front compartment that would prevent the engine battery from being charged from the converter while on shore power? It appears very difficult to access that box for component replacement any ideas/recommendations?
Coach batteries OK.
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Old 10-20-2016, 06:09 PM   #2
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I believe that on most older Winnebagos the chassis batteries are not charged by the converter. I added a Trik-L-Start to mine to keep the chassis batteries charged.
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Old 10-20-2016, 06:11 PM   #3
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Most likely you have a BCC (battery control center) that isolates house and chassis batteries until a charging voltage is detected, either from the engine alternator or the converter/charger. Then the two groups of batteries are connected for charging. Winnebago offers wiring diagrams that will show how your RV is wired.
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Old 10-20-2016, 06:16 PM   #4
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pace89, as PJStough said your chassis battery is not charged by the converter to best thing to do is add a Trik-L-Start.
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Old 10-20-2016, 06:33 PM   #5
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Smart Dual Battery Isolator. This costs $ 80. It would let your shore power converter also charge your chassis battery, and will also let the chassis alternator charge the coach batteries, too. You will want to use at least 4 gauge wire between the positive terminals on this and the respective batteries.

https://www.amazon.com/Smart-Battery...al+battery+kit
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Old 10-20-2016, 08:20 PM   #6
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Quote:
Originally Posted by grtharris View Post
pace89, as PJStough said your chassis battery is not charged by the converter to best thing to do is add a Trik-L-Start.

I installed the trick-l-charger on my 2003 sightseer.
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Old 10-21-2016, 07:21 AM   #7
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Thank you

Thanks to all for your replies. I did have a trickle charger installed which I thought would be a backup for the converter, since it is not a backup as the converter does not charge the engine battery and the trickle charger either failed or lost connection.
I have decided to use powercat_tras recommendation and install a smart dual battery isolator, I have ordered the recommended part from Amazon thanks again for everyone's input.
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