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Old 10-22-2020, 03:02 AM   #1
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Join Date: Nov 2019
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2005 Monaco Dynasty electrical problem

I changed out my primary fuel filter a couple of days ago. Tried to prime the filter, but to my surprise, the chassis batteries were dead even though they were plugged into shore power. Tried the battery boost with no luck.
It appears that suddenly shore power is not charging the chassis batteries, but is charging the house batteries. My understanding is once the house batteries are full the system then it charges the chassis batteries. All batteries are about a year old. I then replaced the BigBird Solenoid and charged the chassis batteries with regular external battery charger. All charged now. Tried to start the coach again, but no luck at all - absolutely nothing worked. Nothing lights up on the dash, transmission or panel to put the motorhome into travel mode. Tried to start the generator. Nothing at all. Tried to open the generator slide - nothing. Tried to start the engine with the rear/front start in the engine compartment. No response at all. And the only other odd thing - the monitor on the Aladdin on the dash shows no display now. That was working prior to the this. All DC items work. I have checked all the fuses.
Not sure where to begin now. Any guidance would be much appreciated!
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Old 10-22-2020, 07:29 AM   #2
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I would start by checking the ground cable connections at the engine and chassis .

Are you sure the boost is operating ? Have someone listen .

You said " All DC items work " , you mean coach / house items ?

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Old 10-22-2020, 09:37 AM   #3
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Mine did the same thing and the first thing I checked was the battery disconnect, which failed. No power at all to the chassis. Check it with a multimeter. To get by I just bypassed, bolting both wires together and taping.

This would also explain why the chassis battery went bad.
Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 250 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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Old 10-22-2020, 10:57 AM   #4
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The battery disconnect switches often fail. Here's a good replacement rated at over 1200 amps.
Bill & Brigitte
06 Windsor PEQ, Cummins 400 ISL
2014 Honda CRV
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Old 10-22-2020, 12:28 PM   #5
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I think you tried to fix it correctly, but Bill may be right about the cutoff switch.

I assume you have checked for corroded terminals?
When you disconnect the chassis battery, what is the voltage reading checking directly on the battery terminals?
What is the voltage reading on each of the two large lugs on the bottom of the Intellitec Big Boy solenoid? Check from each lug to a good ground.
97 Monaco Windsor- Sold
07 Monaco Executive McKinley- Sold
04 Monaco Signature Chateau IV
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Old 10-22-2020, 02:44 PM   #6
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DId you possibly turn the rear run box starting switch to off or rear?
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Old 10-22-2020, 04:10 PM   #7
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Welcome to the forum, have you had your RV for awhile or is it a new purchase.
I use attached to charge chassis batteries.
Attached Files
File Type: pdf Echo-charge-OwnerGuide(445-0204-01-01).pdf (618.4 KB, 3 views)
2002 Monaco Executive 500 ISM
2004 GMC 2500HD 4X4
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Old 10-24-2020, 02:19 AM   #8
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We checked all the ground cable chassis battery and engine connections, and all were good. The battery disconnect operated properly when tested with the multimeter. Checked the lugs at the bottom of the BigBoy and they checked out great. No corrosion on the terminals. The starter switched were in the proper position depending on when we started it from the front or the rear. Tried again starting it from the rear. Absolutely no response. Tried the boost. No sounds, no response. Still no response when I put the key in the ignition. No dash lights, transmission lights, etc.
Interesting though, that the switch to open the generator slide came to life and the generator is available to start, which brings me to the next question. Since my primary fuel filter for the engine has not been primed yet, is the use of the generator going to be a problem? Not sure if it is associated with the generator in some way that could cause a problem.
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Old 10-24-2020, 08:37 AM   #9
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Using the generator should not be a problem.

Did you check voltage starting at the battery then working your way down the wiring.

Did you check the main 12 volt power supply to the front of the coach, there is probably a "+" post either on the firewall and/or in the drivers side run bay.
Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 250 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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Old 10-24-2020, 09:33 AM   #10
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On our coach, an '06 Dynasty, the "ignition" key has to be on for the Rear Start switch to function. Just checking.
Jim & Angie, Boise, ID
2006 Monaco Dynasty Countess III
2017 GMC Acadia Denali
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