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11-08-2010, 10:16 AM
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#1
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Senior Member
Join Date: Oct 2010
Posts: 629
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Looking for some professional input here. Problem is that the alternator is not charging the house batteries. With engine running for several minutes there is no power to the isolator solenoid. If I hold down the booster switch there is power to the solenoid but it still does not send a charge to the house batteries. It sounds to me like two problems.. solenoid not working and also that it is not getting the signal sent from the board when engine is running..... does this sound right?
2008 Holiday Rambler 340 cummins
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11-08-2010, 06:28 PM
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#2
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Senior Member
Monaco Owners Club
Join Date: Dec 2009
Location: Underwood WA
Posts: 114
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You might want to review my post on 10/26/10 titled "does anyone know if..." I have had a similar problem and posted my quest to find the problem, and the solution I came up with. If you find another solution, or what the problem really is, let me know. Dick
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Bev & Dick and Fuzzy the cat
2005 Safari Cheetah 38
2009 Honda CRV dinghy
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11-08-2010, 09:13 PM
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#3
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Senior Member
Join Date: Oct 2010
Posts: 629
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I have an appointment tommorow morning to have it fixed. I will let you know the outcome.
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11-08-2010, 09:56 PM
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#4
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Senior Member
Join Date: Dec 2009
Posts: 444
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Sounds to me like your Battery Isolator/Boost relay is bad. Even if the B.I.R.D. sends a signal to a bad relay it won't carry current to the other set of batteries.
Don't be tricked into thinking the isolator/boost relay it is good because it clicks when you push the switch. If it won't pass current, its bad.
The relay for our 98 DSDP was $50 from Master Techs Inc.
We hope this helps
Don
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11-08-2010, 10:25 PM
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#5
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Senior Member
Join Date: Oct 2010
Posts: 629
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Quote:
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Don't be tricked into thinking the isolator/boost relay it is good because it clicks when you push the switch. If it won't pass current, its bad.
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I was tricked at first until I checked the voltage at the house battery. Hopefully I will have my answers tomorrow.
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2008 Holiday Rambler Vacationer 340 Cummins
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11-08-2010, 10:28 PM
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#6
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Senior Member
Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 993
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In the past did it ever charge the house batteries?
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2004 Monaco La Palma 36DBD, W22, 8.1
7.1 MPG based on fuel used over 60,000 miles
2000 LEXUS RX300 FWD 22MPG 4020 LBS
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11-09-2010, 05:42 AM
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#7
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Senior Member
Join Date: Oct 2010
Posts: 629
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Quote:
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In the past did it ever charge the house batteries?
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Good question. I suspect it did when it first rolled off the line. The house batteries started going dead on me a couple of months ago when parking overnight with no hookups. The booster would not help with starting the genny and this is what directed me to the isolator relay. Changed the batteries and now I have to make sure they get their fair share of charge while driving. Leaving in 20 minutes for the dealer...... will report back....
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2008 Holiday Rambler Vacationer 340 Cummins
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11-09-2010, 09:29 AM
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#8
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Senior Member
Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 993
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The reason I asked is that my alternator has never charged my house batteries and that's by design.
Not all coach engines charge house batteries.
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2004 Monaco La Palma 36DBD, W22, 8.1
7.1 MPG based on fuel used over 60,000 miles
2000 LEXUS RX300 FWD 22MPG 4020 LBS
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11-09-2010, 11:36 AM
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#9
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Senior Member
Join Date: Oct 2010
Posts: 629
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Quote:
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Not all coach engines charge house batteries.
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Do you have a solenoid near the batteries that connect both banks of batteries?
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2008 Holiday Rambler Vacationer 340 Cummins
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11-09-2010, 11:39 AM
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#10
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Senior Member
Join Date: Oct 2010
Posts: 629
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Just a little update on my situation. Took it to the dealer today and problem is fixed. They replaced the isolator solenoid ( the one that connects battery banks) and also replaced the circuit board at the front ( isolator relay delay circuit board) I think it might be called a diode not sure. The solenoid was toast and probably caused the circuit board to burn out. I could see the burn mark on the circuit. Paid my 50 dollar deductible and now I'm home problem solved.
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2008 Holiday Rambler Vacationer 340 Cummins
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11-09-2010, 04:43 PM
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#11
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Senior Member
Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 993
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Quote:
Originally Posted by Monacoach
Do you have a solenoid near the batteries that connect both banks of batteries?
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No I don't.
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2004 Monaco La Palma 36DBD, W22, 8.1
7.1 MPG based on fuel used over 60,000 miles
2000 LEXUS RX300 FWD 22MPG 4020 LBS
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11-09-2010, 08:38 PM
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#12
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Senior Member
Join Date: Oct 2010
Posts: 629
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So how are you batteries wired? What keeps them charged when you are driving?
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2008 Holiday Rambler Vacationer 340 Cummins
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11-10-2010, 10:04 AM
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#13
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Senior Member
Workhorse Chassis Owner
Join Date: Nov 2003
Location: Mesa, AZ USA
Posts: 1,572
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Quote:
Originally Posted by Arch Hoagland
The reason I asked is that my alternator has never charged my house batteries and that's by design.
Not all coach engines charge house batteries.
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Then how do the house batts get charged?
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Wretched excess is just barely enough.
2002 Itasca Suncruiser - WH Chassis - 35U - 2006 Jeep Liberty
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11-10-2010, 04:53 PM
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#14
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Senior Member
Join Date: Dec 2009
Posts: 444
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MHs that "by design" don't charge the house batteries w/alternator, have 3 ways to charge them, 1) generator, 2) shore pwr, 3) solar.
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