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Old 05-10-2018, 02:10 AM   #1
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Sprinter chassis alternator also charge coach batteries?

Seems like a really newbie question I have here. Does the Sprinter chassis alternator charge the coach batteries? I here conflicting information about this.
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Old 05-10-2018, 02:12 AM   #2
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Yes, on our 2012 Solera "S".
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Old 05-10-2018, 04:18 AM   #3
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Yes
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Old 05-10-2018, 12:37 PM   #4
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It will as long as the battery switch is on - at least in my Prism, that's how it works.
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Old 05-11-2018, 02:02 PM   #5
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Seems like a really newbie question I have here. Does the Sprinter chassis alternator charge the coach batteries? I here conflicting information about this.
As others have said, yes. A good "tool" to carry is battery system monitor that plugs into one of your 12-volt power receptacles. Good for check engine battery too. This is the one I have:

https://www.amazon.com/INNOVA-3721-B...battery+tester
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Old 05-11-2018, 04:45 PM   #6
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As others have said, yes. A good "tool" to carry is battery system monitor that plugs into one of your 12-volt power receptacles. Good for check engine battery too. This is the one I have:

https://www.amazon.com/INNOVA-3721-B...battery+tester
One of these is a must... never thought of using it to monitor charge but will save you from burnt out AC ect..
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Old 05-11-2018, 07:01 PM   #7
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How about on my 2018 Isata-3?
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Old 05-11-2018, 09:52 PM   #8
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Thank you all for your helpful replies. I have since installed a shunt type battery monitoring system so I won't have to guess about the condition of the batteries.
Having fully charged batteries (>14 volts) really becomes important when moving a big slide in/out.
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Old 05-11-2018, 10:12 PM   #9
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How about on my 2018 Isata-3?
Jack, the Isata 3 is essentially a Sunseeker/Forester MBS in a suit. What applies to those should apply to your rig, a very nice one which I'm sure you are enjoying.
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Old 05-12-2018, 01:15 PM   #10
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Last trip I had a problem running the slide on batteries only, that resulted in the slide being out of sync.Since then I always fire up the generator(if not on power) to bring in the slide.
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Old 05-12-2018, 02:19 PM   #11
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Jack, the Isata 3 is essentially a Sunseeker/Forester MBS in a suit. What applies to those should apply to your rig, a very nice one which I'm sure you are enjoying.


My 2017 Isata 3 goes both ways; the alternator charges chassis and coach and the converter does the same.
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Old 05-12-2018, 03:59 PM   #12
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And generator charges house and coach batteries when running. ( coach probably charging thru the converter) . I've confirmed this in the past using a volt meter.
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Old 05-12-2018, 11:49 PM   #13
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Last trip I had a problem running the slide on batteries only, that resulted in the slide being out of sync.Since then I always fire up the generator(if not on power) to bring in the slide.
Excellent point, Beach! I am now following that practice myself.

I am also calendaring to resynch the slide motors at least quarterly. This is a simple procedure shown in several excellent videos on YouTube from Lippert Components.
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Old 05-13-2018, 12:56 AM   #14
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<snip>

I am also calendaring to resynch the slide motors at least quarterly. This is a simple procedure shown in several excellent videos on YouTube from Lippert Components.
I thought one just held the slide switch on for 2-3 seconds after the slide stopped moving (both directions) to keep them in synch?? Am I missing something? I do that every time.
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Old 05-13-2018, 02:20 AM   #15
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I thought one just held the slide switch on for 2-3 seconds after the slide stopped moving (both directions) to keep them in synch?? Am I missing something? I do that every time.
That is correct. Infrequently, I will intentionally or not, let off the in/out slide switch while operating the slide e.g.
finger slipping off the switch or noticed an item on the floor that had to be moved out of way. I think a few instances like that may throw off the timing of the two 12V motors working together and need resynching.

....or maybe I'm just a sloppy slide operator.
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Old 05-13-2018, 08:27 AM   #16
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That is correct. Infrequently, I will intentionally or not, let off the in/out slide switch while operating the slide e.g.
finger slipping off the switch or noticed an item on the floor that had to be moved out of way.<snip>.
LOL - BTDT a few times
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Old 05-13-2018, 04:59 PM   #17
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Excellent point, Beach! I am now following that practice myself.

I am also calendaring to resynch the slide motors at least quarterly. This is a simple procedure shown in several excellent videos on YouTube from Lippert Components.
Battle Born Lithium Batteries keep the Voltage over 13V even under load. I ran my slide in and out with the batteries at 20% SOC with no problems. Never worry about running generator with slide anymore.
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Old 05-14-2018, 01:53 AM   #18
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Battle Born Lithium Batteries keep the Voltage over 13V even under load. I ran my slide in and out with the batteries at 20% SOC with no problems. Never worry about running generator with slide anymore.
Lead-acid batteries are fast becoming obsolete as will lithium batteries be replaced using emerging graphene and supercapacitor technologies.

I would love to have state-of-the-art batteries but their high cost, coupled with my old guy recalcitrant stingy attitude, will cause me to suffer through the useful remaining life of the lead-acid batts I have now.

PS I was wondering if Forest River now has a lithium battery option or was this an aftermarket upgrade you made?
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Old 05-14-2018, 09:00 PM   #19
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Thank you all for your helpful replies. I have since installed a shunt type battery monitoring system so I won't have to guess about the condition of the batteries.
Having fully charged batteries (>14 volts) really becomes important when moving a big slide in/out.
Your batteries are never charged to 14 volts. That is only a surface charge that exists for a short while after you have charged with the genny or shore power.
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Old 05-15-2018, 03:39 PM   #20
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Your batteries are never charged to 14 volts. That is only a surface charge that exists for a short while after you have charged with the genny or shore power.
Depends on the Batteries, Lithium charge to 14.5V
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