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Old 04-08-2019, 11:42 PM   #11
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Originally Posted by PhillyGeorge View Post
Got it. I'll have to research the Trik-L-Start to see how it works and how it is installed.

Quick follow up question: You said, "I wouldn't want my coach charger making decisions on behalf of my chassis starter battery." Can I assume that the reverse would be true also. That is, that you wouldn't want the Trik-L-Start (connected to the chassis battery) sending a charge back to the house batteries - meaning that you would want the battery separator to open the circuit so that power is not sent back to the house batteries?

To do this, I would think that I would need to manually disengage the Blue Sea ACR (open the circuit) which means that I would need to have a remote switch installed to do this ??? (I am assuming that the Trik-L-Start puts out more than 13V which would normally trigger the ACR battery separator to close the circuit.)
Yes, I don't think that the ACR and Trik-L-Start are mutually compatible. I think your analysis about the Trik-L-Start activating the relay is correct. That wouldn't be good. In fact, a Trick-L-Start is typically wired across the isolation relay, such that when the relay closes, its input and output are shorted and so it is effectively removed from the system. This in turn would cause the ACR to open, which would put the Trik-L-Start back into the system. Rinse and repeat... Looks to me like you would end up with an oscillator. Not good.

So, I think your choice is to leave it as is (after first figuring out why it isn't working), or removing the ACR and replacing it with a dumb isolation relay and adding the Trik-L-Start.

Formerly: 2005 Airstream Interstate (Sprinter 2500 T1N)
Now!: 2014 Great West Vans Legend SE (Sprinter 3500 NCV3 I4)
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Old 04-09-2019, 01:06 AM   #12
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Makes sense. Thanks for the additional info.


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Old 04-14-2019, 07:59 PM   #13
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My two cents from a similar issue: I bought a new battery, since mine would no longer hold a charge well. Now I use a small solar charger (7.5 Amps max) connected to the cigarette lighter (which is on even after ignition is turned off), and trickle charge the chassis battery. Solar panel is left on the windshield when storing even for a few days. I have a MB sprinter and there is quite a bit of parasitic discharge. Sprinters seem to be designed to be used frequently.
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Old 04-15-2019, 03:41 PM   #14
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FYI, my problem appears to be solved. There is a red control wire coming from the Blue Sea ACR that is used to add a separate control switch. However, Sportsmobile had wired this to the chassis power system in a way that defeated the bi-directional sensing for the ACR. I just cut this wire and it looks like it is now working fine and charging the chassis battery from shore power.

Thank you to all who responded to my questions.

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battery separator, blue sea ml-acr, chassis battery, dead battery, trickle charger

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