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Old 03-30-2008, 05:51 PM   #1
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Motor Home batteries not charging

OK,
2000 AS LY 350 gas MH
I replaced my two RV batteries because they where dead,
Now my new ones are not charging ? I drove 1100 miles and the left the thing for the afternoon and had the porch light on and they where dead???
Any help ?
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Old 03-30-2008, 06:14 PM   #2
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Quote:
Originally Posted by myfirstrv
OK,
2000 AS LY 350 gas MH
I replaced my two RV batteries because they where dead,
Now my new ones are not charging ? I drove 1100 miles and the left the thing for the afternoon and had the porch light on and they where dead???
Any help ?
Lots of possibilities here. From your description it sounds like your engine battery is keeping its charge which should indicate your alternator is functioning.

If you have a generator on board you might try running it to see if the batteries charge. The generator system connects to the coach batteries in a different location compared to the alternator.

There is also an isolator probably located somewhere under your front hood that should have 3 posts on it. One post should be wired to your alternator output, the 2nd post should go to your engine battery and the 3rd post should go to your coach batteries. If the isolator is bad it could possibly keep the alternator from charging the coach batteries.

Bottom line is you're going to have to do some troubleshooting. Having a decent volt/ohm/meter would certainly help.

Sorry I can't offer anymore suggestions.

Good luck!

Brad
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Old 03-30-2008, 06:26 PM   #3
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Did you ever charge the new batteries with a charger at least overnight?

RV batteries that are wired in behind the Coach batteries will not charge off the Coach if they are wired through an isolater. All isolaters have a diode in them and there is a .9 volt drop across the diode. If the Coach batteries are fully charge the regulator in the alternater will see this and shut down against the Coach batteries.

Charge the RV batteries with a battery charge for at least 12 hours and then see how things are.

I have been thinking of a switching sytem for the alternater that would alternatly look at the Coach and RV for many years. Such a system would fully charge both sets of batteries. Maybe someone will invent it someday.
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Old 03-30-2008, 07:22 PM   #4
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OK
I seem to remember to be able to start the generator with out the engine running, Now I have to start the engine to start the Generator ?
I will try to charge the batteries, by the way I have had this thing plugged into shore power for days, 50 amp shore power?
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Old 03-30-2008, 07:26 PM   #5
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Brad ,
I will check out the Isolator,

HowieE
Are you saying that unless they have a charge the isolator wont charge them ? Or the isolator will never charge them regardless?
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Old 03-30-2008, 08:23 PM   #6
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Quote:
Originally Posted by myfirstrv
OK
I seem to remember to be able to start the generator with out the engine running, Now I have to start the engine to start the Generator ?
I will try to charge the batteries, by the way I have had this thing plugged into shore power for days, 50 amp shore power?
Somewhere on your dash should be a switch that normally lets you use the coach batteries to assist in starting the engine if the engine battery was dead. I'm wondering if this also works in reverse. Can you hold the switch in and try to start the genrator? Its possible there is an isolator that will keep this from happening but it might be worth a try!

Good luck!

Brad
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Old 03-30-2008, 08:26 PM   #7
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Quote:
Originally Posted by myfirstrv
HowieE
Are you saying that unless they have a charge the isolator wont charge them ? Or the isolator will never charge them regardless?
It is my understanding that an isolator has a diode in it. The isolator will limit the charge to the Coach batteries to .9 volts below that of the Coach and will only charge as long as the Coach batteries are calling for a charge. The alternator will charge until it's regulator is satified seeing a fully charged Coach batteries. It is possible to actually run the Coach batteries down and restart the Coach off the RV batteries if you have a back feed switch. Under this condition the alternator would recharge the Coach batteries, isolated from the RV by the isolator, because the regulator sees the dead Coach batteries.

The opposite is not possible. Once the RV batteries are dead they have to be charged off a shore line or generator.
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Old 04-10-2008, 05:21 PM   #8
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Brad,
Just got in town and checked on the beast
You are correct "You can hold the AUX start switch in to start the generator while the truck/engine battery is charged"
This did start the generator, only when the engine was running.
Now I still need to check the the isolator.
Can I remove the isolator and take it some place to be tested ?
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Old 04-11-2008, 09:52 AM   #9
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Quote:
Originally Posted by myfirstrv
Brad,
Just got in town and checked on the beast
You are correct "You can hold the AUX start switch in to start the generator while the truck/engine battery is charged"
This did start the generator, only when the engine was running.
Now I still need to check the the isolator.
Can I remove the isolator and take it some place to be tested ?
Just a quick thought here. On our 84 Classic there is a battery disconnect switch located in the battery compartment. Is there any chance this switch is in the off position? I think if the switch was off you'd experience the same symptoms as you are now.

As far as removing the isolator, yes you can but make sure you disconnect all the batteries before doing so.

Brad
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Old 04-12-2008, 11:48 AM   #10
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Help !!!
ok new problem
I start the generator, and I have NO AC in the motor home ???
Is this still the isolator? or arewe looking a much bigger problem ??
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Old 04-12-2008, 11:50 AM   #11
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Sorry to clarify --AC as in 110 volt AC not Air Conditioning
no AC 110volt things work like the microwave, the fridge etc...
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Old 04-12-2008, 09:22 PM   #12
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Quote:
Originally Posted by myfirstrv
Sorry to clarify --AC as in 110 volt AC not Air Conditioning
no AC 110volt things work like the microwave, the fridge etc...
Maybe it would be better if you just stayed away from home.... Sorry couldn't resist!

There are several possibilities, one it could be your main breaker (or one of the other breakers) has tripped. Or the breakers on your generator itself have tripped. There are probably two breakers on your generator so check both.

More details on what you've tried, etc would be helpful.

Good luck!

Brad
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Old 04-12-2008, 09:30 PM   #13
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It could be as simple as the plug jostled out of position, and all you have to do is plug it back in. The plug SHOULD be at the rear of the generator compartment, if it is like most I've seen.
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Old 04-12-2008, 09:40 PM   #14
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Originally Posted by overlander63
It could be as simple as the plug jostled out of position, and all you have to do is plug it back in. The plug SHOULD be at the rear of the generator compartment, if it is like most I've seen.
Terry,

The Classic series (I'm not sure if Myfirstrv's 93 is the same) use transfer relays to transfer between shore power and the generator. You don't have to plug the shore power into an outlet on the motorhome for the generator to feed power to the coach.

Of course the above statement only applies if Myfirstrv's motorhome is wired the same as the Classic motorhomes were wired .

I'm hoping he provides some more detailed information to help troubleshoot the problem.

Brad
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