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Old 04-03-2015, 11:11 AM   #11
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Originally Posted by Duckogram View Post
Your chassis is a Mercedes Benz Sprinter 3.0 Diesel that came with a battery. I know that my baby benz has the battery under the floor of the passenger foot well. I do not know where MB hides your chassis battery if it is not stuffed under the hood someplace. It is likely to be in a box so it may not look like a battery. Just follow the cables and you will find it. Or you can just call your deslership service dept and they will tell you.
Also, I have an emergency switch that will start the coach engine from the house batteries. That was a coachmen factory install. If you kill your house batteries you will not he able to start your generator without a jump.
Since you bought new, you must have the Chassis owners manual. That is a good reference for your question as well.
But can't you use the emergency start (es) to also start the genny since the es ties the 2 systems together unless of course the chassis battery supplies the 12 volts to the switching circuitry? This is the way my GT Georgetown will function. Maybe not yours.
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Old 04-03-2015, 11:31 AM   #12
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Ducko... most of the Sprinters use propane generators. I would think that jump starting the generator would not work IF the propane solenoid has been closed due to flat batts and a dead lp gas detector. Am I wrong about this? Seems like you need to get a green light on the lp detector then you should be good to go.
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Old 04-03-2015, 11:33 AM   #13
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I found the 3rd battery under the drivers side floor mat.
If this battery is dying and it is not connected to the house stuff maybe, as suggested, it has gone bad.
I'll pull it out and get it checked and replace it if necessary.
Thanks.
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Old 04-03-2015, 11:53 AM   #14
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NO....wrong. If your engine starts that battery is fine. The other batts are dead because your engine alternator does NOT charge them as you thought. That is NOT a feature of your coach. The ONLY ways to charge your house batteries are the coach plug & converter OR the generator (but you can't start that with dead house batteries).
PLUG IN THE COACH AND TAKE A BATTERY READING WITH A VOLTMETER AT THE STEP BATTERY TERMINALS
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Old 04-03-2015, 12:01 PM   #15
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That's the problem the engine does not start.
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Old 04-03-2015, 12:18 PM   #16
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Ahhh...so all batteries dead. Just jump the engine battery from your car and let it run for a couple of hours to get a bit of a charge on it. This will not cure your other battery problems. And you may have damaged the engine batt.
To future proof the engine bat starting problems you have TWO choices:
1. A trickle charger when not in use like the battery tender:Battery Tender Plus 021-0128 12V Battery Charger - Walmart.com
2. Remove the negative wire from the batt OR install a disconnect switch like this:
Everstart 936W Positive and Negative Terminal Disconnect for 12-or-24-Vehicle Dynamic Control Systems - Walmart.com
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Old 04-03-2015, 02:06 PM   #17
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To clarify an issue raised on this post: I have a Prism 24g and the House batteries are charged whenever the coach is running as long as the system is otherwise working correctly.
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Old 04-03-2015, 02:17 PM   #18
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I also have a 2015 Prism 24G. Great coach!
I have some slightly different opinions.
Regarding charging the house batteries from the engine alternator, I'm not 100% certain, but I believe it does. A few days ago I discovered that I had stupidly left the porch lights on, and forgotten to turn off the battery switch. Although the battery charge indicator (otherwise known as idiot lights) showed "2", the generator wouldn't start. I didn't know about, or don't have, the emergency switch mentioned by Duckogram, so I simply started the engine, which then allowed the generator to start up. I assume that was because the alternator was providing additional charge.
Also, I note that after driving, the battery status indicator shows more lights.
Duckogram, where is your emergency switch located? I thought the Prism came with one, but I can't find it. A picture would help.
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Old 04-03-2015, 02:25 PM   #19
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More confusion! Well....easy to check. Put a multimeter on the house battery terminals when the engine is running AND the 12V lights are turned on & working (i.e. cutoff switch is disengaged). If it is over 13V then the alternator charges the house batts as well.
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Old 04-03-2015, 02:28 PM   #20
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That's the problem the engine does not start.
Ahh. The coach does not start. You drove for days and it did not charge. The house batts did not charge. You did not run the generator and you did not plug into shore power.
If all the above is correct and assuming mdf123 post is applicable to your unit as well, it would appear that your coach has an electrical problem...

If any of the above is not true, you may have more than one problem.

My best advice is to take it to the dealer, its under warranty.
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