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Old 11-28-2010, 05:46 PM   #1
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Join Date: May 2004
Location: cayucos, ca
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Angry Cranking battery not being charged when on shorepower

Well here we go again. I thought I had this fixed. I called Monaco and they said that it was a bad circuit board back by the "Big Boy" solenoid. So I ordered one and installed it. I checked and the battery had 13 volts going to it. So it must be charging. That was 4 months ago. 4500 miles and we are home. Been here for a month plugged in. Went to start engine today and clunk. Dead batteries. I dont know where to look this time. Anybody have an idea.

05, Navigator with 60 series Detroit Diesel...........
Ross Starkenburg
2017 Newmar Dutch Star 4369. Spartan chassis w/full disc brakes. 2015 Jeep Grand Cherokee toad
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Old 11-28-2010, 09:29 PM   #2
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Join Date: Apr 2007
Posts: 470
You might have the MegaTech Board which only charges the battery when you go over the float charge level..So it charges your battery, then when house battery gets to float charge level...cuts out...

That board is being updated and I am ordering a new one from MegaTech the day it becomes available...Meanwhile, I have a Trik-L-Start hooked up now between house and chassis batteries while plugged in and being stored..This keeps all batteries up. When I get the new board when the weather warms up again before next season I intend to install it. (My board is in the front driver bay and you can see where the batteries go into it.) I don't your coach and am basing my guess above on what I have. Mine will keep coach when using it, but during storage, once I hit float charge...the house batteries drop out and the Trombetta Relay no longer stays closed.

Hook up a Trik-L-Start now or depending on your inverter manufacturer (Xantrex or Magnum) they both make units you can add on for a bit more. Trik-L-Start was my best workaround until the new board is available.
Stuart and Stella Denning
2016 Entegra Aspire 42RBQ
3 Bullies and a Diesel Pusher
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Old 11-29-2010, 08:09 AM   #3
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Join Date: Apr 2008
Location: Carlsbad, NM
Posts: 116
Have you tested the chassis batteries with a hydrometer. Put a regular charger on them then check and see if they are good. Your coach is 5 years old so batteries are at the end of their lifeline if original.
Phil Carrell
Carlsbad, NM
2008 Monaco Executive, 2011 Chev Traverse
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Old 11-29-2010, 12:08 PM   #4
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Location: cayucos, ca
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Trombetta, Mega Wow i have a few things to learn about. Regarding the batteries, they are AGM sealed batteries and are good for about 10 years. Also I checked them and the do hold a charge. It is the small electrical leaks caused by the keep alive computer circuits and such that are drawing down the power.
Ross Starkenburg
2017 Newmar Dutch Star 4369. Spartan chassis w/full disc brakes. 2015 Jeep Grand Cherokee toad
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Old 11-29-2010, 12:48 PM   #5
"Formerly Diplomat Don"
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Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 21,595
Stretch.....Install the Trik-L-Start or the Xantrex Echo Charger and eliminate the circuit boards by Monaco. They have been problematic. I first installed the Trik-L-Start several years ago and it eventually started to have issues. I bought the Echo Charger which is a more substantial unit and it works great. Magnum Inverter also makes a unit now.
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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