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Old 11-08-2010, 11:16 AM   #1
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Battery Isolator

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?

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Old 11-08-2010, 07:28 PM   #2
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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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Old 11-08-2010, 10:13 PM   #3
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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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Old 11-08-2010, 10:56 PM   #4
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Battery Isolator relay

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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Old 11-08-2010, 11:25 PM   #5
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Quote:
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.
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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Old 11-08-2010, 11:28 PM   #6
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In the past did it ever charge the house batteries?
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Old 11-09-2010, 06:42 AM   #7
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In the past did it ever charge the house batteries?
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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Old 11-09-2010, 10:29 AM   #8
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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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Old 11-09-2010, 12:36 PM   #9
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Quote:
Not all coach engines charge house batteries.
Do you have a solenoid near the batteries that connect both banks of batteries?
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Old 11-09-2010, 12:39 PM   #10
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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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Old 11-09-2010, 05:43 PM   #11
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Originally Posted by Monacoach View Post
Do you have a solenoid near the batteries that connect both banks of batteries?

No I don't.
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Old 11-09-2010, 09:38 PM   #12
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So how are you batteries wired? What keeps them charged when you are driving?
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Old 11-10-2010, 11:04 AM   #13
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Quote:
Originally Posted by Arch Hoagland View Post
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.
Then how do the house batts get charged?
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Old 11-10-2010, 05:53 PM   #14
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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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