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Old 10-29-2016, 11:36 PM   #1
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2017 - Dead chassis battery

.......after just ten days.....?

2017 ASI Lounge

Just stopped by the hangar to check on the 4x4 Interstate and was shocked to find a dead chassis battery.

How would the chassis battery drain in just ten days while the coach is plugged in? Coach batteries are charged, but chassis battery is dead and the battery assist does not "assist!"

This is our 4th interstate and we have never experienced this before.

Guest Switch

Well, that's what you call it in a boat...

......left the main coach disconnect switch in the open / on position this time based upon feedback from Airstream. That's the only thing I did differently when I parked her.

Any ideas? Maybe I left the FUSION unit turned on?
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Old 10-30-2016, 04:48 AM   #2
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You almost had to leave something on. I think the chassis battery is isolated from the house battery, so leaving the inverter unit powered up SHOULD have only killed the house battery.
Before monkeying with it too much, you might want to head over to the dealership for them to take a look at it. It is possible, if it spent a long time sitting on the lot, the battery sulfated to the point it won't hold a charge. If that's all it is, either MB or AS should be able to help you.
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Old 10-30-2016, 04:50 AM   #3
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Oh, as to why the assist didn't work, there needs to be just a little juice in the chassis battery to enable the switch to work.

I also remember there being two use/store switches in those vans. One in the panel, one in the compartment where the fuses/breakers are. It's possible you left something on, and didn't isolate the chassis battery like you thought you did.
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Old 10-30-2016, 09:12 AM   #4
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Update: Clue

When inserted, the key won't turn forward, or aft, in the ignition.




2017 4x4 Interstate
Bend, Oregon
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Old 10-30-2016, 09:49 AM   #5
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dead sprinter

a long shot... foot on the brake?
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Old 10-30-2016, 10:34 AM   #6
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Quote:
Originally Posted by ScottP View Post
Update: Clue

When inserted, the key won't turn forward, or aft, in the ignition.

2017 4x4 Interstate
Bend, Oregon

You are double posting on two threads which is confusing. I answered you on other thread on "Interstate Battery issues". Other replies above are from trailer owners that may not be accurate.

The battery assist switch is a momentary on and must be held on to get the battery assist to start the van. If that is not working with fully charged house batteries - something is wrong. The chassis battery can be totally dead and the assist should still work as it only needs house battery power. Press and hold the assist button for a few seconds before you try to turn the key. There has to be some power on the Sprinter battery to make the key work. Keep holding that assist button to get the van started. It will take some time, a minute or two, for power from house battery to bring the chassis battery up to voltage to start the van. It's just like using booster cables.

It does sound like there is something could be wrong with your Battery Isolation Manager (BIM). It should have kept your chassis battery charged if plugged in no matter what you left turned on.


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Old 10-30-2016, 10:34 AM   #7
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Quote:
Originally Posted by ScottP View Post
Update: Clue

When inserted, the key won't turn forward, or aft, in the ignition.




2017 4x4 Interstate
Bend, Oregon


I also have a '17 and I think you might have a bad chassis battery. The way the BIM/BS works is as long as the house batteries are above 13v, and they should be if plugged into shore power, then the BIM will connect the chassis battery and house batteries together. Assuming the BIM is working properly, the only way the chassis battery won't charge is if it's damaged.

This may also explain the key not turning because there may not be enough juice for the chip reader to read the chip in the key fob to unlock the ignition. I think this is one reason why the manual tells you to hold the manual "assist" switch for a moment or two before trying to start the engine when the chassis battery is dead.
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Old 10-30-2016, 10:40 AM   #8
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Double Posting - geeez, my bad. Thanks and apologies to all fir the confusion Mike.


Thanks for the assist guys.



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Bend, Oregon
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Old 10-30-2016, 12:32 PM   #9
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What is it with the Germans and stupid engineering....my bosses Touareg diesel is the same way with the ignition key getting trapped in the ignition if the battery is dead.(Insert face palmed smilie here)

To the OP with the battery problem.

Check your BIM system. If not, add a manual kill switch yourself to isolate the batteries from each other for peace of mind.

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Old 10-30-2016, 12:38 PM   #10
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I would have the dealer check the solenoid in the inverter. My 2017 has had numerous battery issues which according to the dealer are the result of a bad solenoid which cause a battery drain. By the way I have owned my Interstate since late July. We have taken a 3 day trip and a 3 week trip with numerous issues. It has been at the dealer for repairs longer than we have had possession of it.
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Old 10-30-2016, 12:53 PM   #11
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2017 - Dead chassis battery

Quote:
Originally Posted by wildwilly. View Post
I would have the dealer check the solenoid in the inverter. My 2017 has had numerous battery issues which according to the dealer are the result of a bad solenoid which cause a battery drain. By the way I have owned my Interstate since late July. We have taken a 3 day trip and a 3 week trip with numerous issues. It has been at the dealer for repairs longer than we have had possession of it.

I think the solenoid you are referring to is the SB-164 upgrade which has been the subject of much discussion in this forum, and many of us have ditched it.

Edit: this only affects the coach batteries, not the chassis battery.


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Old 10-30-2016, 10:14 PM   #12
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If the AI is connected to shore power and both batteries are dead, then wouldn't that point to the inverter/charger?
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Old 10-31-2016, 12:36 AM   #13
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Quote:
Originally Posted by 73shark View Post
If the AI is connected to shore power and both batteries are dead, then wouldn't that point to the inverter/charger?

Was referring to the OP's problem.


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Old 10-31-2016, 07:55 AM   #14
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Quote:
Originally Posted by UKDUDE View Post
I think the solenoid you are referring to is the SB-164 upgrade which has been the subject of much discussion in this forum, and many of us have ditched it.

Edit: this only affects the coach batteries, not the chassis battery.


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I really don't know but Northtrail RV and Mercedes believe that solenoid issue can relate to both the chassis and house batteries. Attached is the service report from North Trail RV who brought the unit to the Mercedes dealer ( and then locked the keys inside):11. GUEST STATES SEE HISTORY THEY WERE HAVING INVERTER AND POWER ISSUES., THE HOUSE BATTERIES WERE NOT LASTING EVEN 8 HOURS WITH ONLY THE FRIDGE IN THE COACH ON.
harged both AGM batterys with shop charger on 2 amp trickle charge for 8 hrs. Disconnected charger at the end of the day and reconnected the next morning. Continued to charge for another 8 hrs. Disconnected and reconnected the next morning. Charged for another 6 hrs. Disconnected and checked batterys for voltage. One battery is reading 12. 8 Volts and the other is reading 13.1 Volts. Performed a load test on each battery using Cen-tech 100 amp load tester. Both batterys tested good. Inspected inverter, wiring and and electrical components for correct operation and found faulty solenoid which isolates the batterys from the inverter when the disconnect switch is de-energized. With the solenoid stuck in the closed position there is a continuous parasitic draw on the batterys.Will need to disconnect both house and chassis batterys,R&R rear D/S jump seat,R&Rscreen cover, disconnect and R&R faulty solenoid.Reconnect house and chassis batterys and recheck system for correct operation. Parts has new solenoid in stock. 1hr diag. 1.5 hrs R&R and recheck electrical system. 1498

Disconnected house battery positive side to the solenoid.Removed existing solenoid and replaced with new. After reconnecting the positive side of the battery i had no power to the solenoid. Found a 150 amp fuse had blown. Ordered fuse from parts dept. on 10/19. PART ON ORDER



13. SUBLET MERCEDES SEE LINE 11
MERCEDES CHECKED OVER THE CHASSIS SIDE TO MAKE SURE THE ISSUE OF THE CHASSIS BATTERY GOING DEAD WAS NOT SOMETHING ON THERE SIDE.
IT WAS RELATED TO THE BAD SOLENOID AND FUSE.
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Old 10-31-2016, 08:04 AM   #15
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Having same issue on my 2017 Interstate. Chassis battery dead, key won't turn.
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Old 10-31-2016, 08:44 AM   #16
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Yikes - sounds like the SB-164 solenoid is really causing a lot of problems. Blowing a 150 amp fuse is serious stuff!


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Old 10-31-2016, 09:07 AM   #17
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Quote:
Originally Posted by UKDUDE View Post
Was referring to the OP's problem.


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Me too.
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Old 10-31-2016, 09:45 AM   #18
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2017 - Dead chassis battery

Wow, yes, this is looking bad! I had SB-164 installed when the bulletin was freshly issued. Lew removed it for me as part of a battery upgrade, and installed a proper cutoff that solves the parasitic drain permanently.
However, I would have thought the BIM should have protected the chassis battery from draining.
Maybe Airstream should issue a bulletin to reverse SB-164!


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Old 10-31-2016, 09:57 AM   #19
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Quote:
Originally Posted by Footballxm View Post
Having same issue on my 2017 Interstate. Chassis battery dead, key won't turn.


Can you hold the assist switch for a few moments and then turn the key?
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Old 10-31-2016, 01:20 PM   #20
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Assist button does not help. Talked to Mercedes dealer. Key is not supposed
to turn with dead battery. Hooked battery charger & got it cranked.
This is the 2nd time battery died. Mercedes checked out battery charger,etc.
Everything is OK. Does not die if plugged into shore power.
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