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Old 03-19-2016, 03:39 PM   #21
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All this battery talk about coach and starting batteries with Senecas, reminds me of my purchase walk-through that the push button switch under the dash to the left will couple starting and coach batteries for cold weather or weak starting batteries. Haven't tried it, but it's there.
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Old 03-21-2016, 07:00 PM   #22
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I checked my chassis batteries without being plugged in and my dash reading indicted 12.2 volts. Plugged in after several hours it still read 12.2 volts. The master switch was always off. So I assume that I am not charging the chassis batteries when plugged in.

Rob, I like your idea about using a Battery Tender plugged into the cigarette lighter. As you can see, my Seneca is same as yours.

One thing to note, depending on the year of your Seneca. Our 2015 has the Precision Circuits isolation manager which allows charging of both the house and chassis batteries when on shore power. The 12v items on the dash (radio/gps and the cigarette lighter power plugs) are all fed by the house 12v system. So, plugging a trickle charger into the cig lighter outlet with this setup would be charging the house batteries and not the chassis batteries.

That's a bummer if Jayco didn't do the same setup on the 2014's.
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Old 03-21-2016, 07:06 PM   #23
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One thing to note, depending on the year of your Seneca. Our 2015 has the Precision Circuits isolation manager which allows charging of both the house and chassis batteries when on shore power. ....snip

That's a bummer if Jayco didn't do the same setup on the 2014's.
They have been using that since at least 2007 on the SENECAS. There is no reason why they would have skipped a year.

That system worked great on our 08.
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Old 03-21-2016, 07:26 PM   #24
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One thing to note, depending on the year of your Seneca. Our 2015 has the Precision Circuits isolation manager which allows charging of both the house and chassis batteries when on shore power. The 12v items on the dash (radio/gps and the cigarette lighter power plugs) are all fed by the house 12v system. So, plugging a trickle charger into the cig lighter outlet with this setup would be charging the house batteries and not the chassis batteries.

That's a bummer if Jayco didn't do the same setup on the 2014's.
I did verify that my dash cigarette lighter is "hot" all the time fed from the chassis batteries. I rewired my radio so that it has keep-alive power from the chassis batteries, since originally it was wired to the coach batteries and would lose its settings every time I shut off the coach batteries. I had to fix that quick!

I have to question how consistent the Jayco wiring is coach to coach; as compared to the assembly line-manufactured Freightliner chassis. While you would hope units are identical, some of what I have heard from other posters leads me to possibly doubt they are.
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Old 03-21-2016, 07:35 PM   #25
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I did verify that my dash cigarette lighter is "hot" all the time fed from the chassis batteries. I rewired my radio so that it has keep-alive power from the chassis batteries, since originally it was wired to the coach batteries and would lose its settings every time I shut off the coach batteries. I had to fix that quick!

I have to question how consistent the Jayco wiring is coach to coach; as compared to the assembly line-manufactured Freightliner chassis. While you would hope units are identical, some of what I have heard from other posters leads me to possibly doubt they are.
I suspect you're right on the wiring. There seems to be a good deal of variation in the electronics (tv, radio brands and such) even within the same model year. They must buy large lots and swap out when they're gone.
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Old 07-17-2016, 09:13 PM   #26
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Where is the Coach batteries located?
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Old 07-18-2016, 04:30 AM   #27
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Where is the Coach batteries located?
The coach batteries on my 2015 FK are in the first basement compartment behind the passenger door. The chassis batteries are under the driver seat.

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Old 07-18-2016, 02:25 PM   #28
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Ok I thought the four batteries in the basement behind the passenger door was the chassis/engine batteries. I will have to look for the batteries under the drivers seat, is there two there?
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Old 07-18-2016, 02:27 PM   #29
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Ok I thought the four batteries in the basement behind the passenger door was the chassis/engine batteries. I will have to look for the batteries under the drivers seat, is there two there?
Yep. Open the driver door, and there is a cover with, if I remember right, two screws that hold it in place. The batteries are behind there. It isn't easy to maneuver in there at all...

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Old 07-18-2016, 02:40 PM   #30
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So the 4 batteries are for the DC lights etc and the batteries under the drivers side is for the engine start etc? The 4 batteries for DC should last quite a while without recharge I would think.
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