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Old 04-14-2015, 05:02 PM   #1
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No power in coach when unplugged (battery good)

It's a Class C Four Winds 23a Majestic

Coach battery is brand new and fully charged (confirmed by multimeter)

I get no 12V power inside the coach when unplugged from shore-power. Even the indicator panel does not work (no lights). The same is true even when the engine is running, but I know for a fact that the alternator is charging the coach battery despite having no 12V power inside the coach.

When plugged into shore power, everything works fine and the battery clearly gets charged by the converter.


How can I tell what's wrong or if my converter needs replacing without spending $300 first?!

Thanks in advance.
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Old 04-14-2015, 05:07 PM   #2
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If you have a battery disconnect switch check and make sure it is on. I don't know where yours is located n\mine is on the right side of near the steps.
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Old 04-14-2015, 05:08 PM   #3
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poppy,

I don't have a battery disconnect switch (that I know of!).
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Old 04-14-2015, 05:32 PM   #4
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You should have a disconnect, either electronic or manual. My Four Winds Hurricane has a panel right next to the door. Yours might be something that looks like this:



The problem as described is what occurs when either the switch is set to disconnect the battery or the solenoid the switch activates has failed. When plugged in the AC to DC convertor is powering the coach systems which is not part of the disconnect circuit.
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Old 04-14-2015, 05:39 PM   #5
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Quote:
Originally Posted by Synthetic View Post
It's a Class C Four Winds 23a Majestic
Coach battery is brand new and fully charged (confirmed by multimeter)
I get no 12V power inside the coach when unplugged from shore-power. Even the indicator panel does not work (no lights). The same is true even when the engine is running, but I know for a fact that the alternator is charging the coach battery despite having no 12V power inside the coach.
When plugged into shore power, everything works fine and the battery clearly gets charged by the converter.
How can I tell what's wrong or if my converter needs replacing without spending $300 first?!
Thanks in advance.
Synthetic
When you say you have a brand new and fully charged "coach battery" do you mean "chassis battery" or "house battery"?

Quote:
Originally Posted by Synthetic View Post
poppy,
I don't have a battery disconnect switch (that I know of!).
If you have one and it accidentally got turned off, (or it went bad), that would be your problem.....(either that or your "house batteries" are dead).

Mel
'96 Safari
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Old 04-14-2015, 05:59 PM   #6
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There is usually also a large breaker on the positive side of the batteries that might have tripped. Start at your batteries and follow the positive line (usually Red or Yellow) and see if you can find a breaker. There might also be one between the Coach and the Engine in the engine compartment.
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Old 04-15-2015, 06:57 AM   #7
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If you have no power from the coach battery even with the engine running you can pretty much eliminate the possibility of the battery itself being the culprit. With the engine running you'd have power to the house portion from the alternator / chassis battery.

It's not very difficult to accidentally short something out while removing or reinstalling a battery, check that (as was said) you haven't got a tripped breaker or blown main fuse.

Oh, and welcome neighbour! LOL.
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Old 04-16-2015, 03:14 PM   #8
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Maybe you have to plug your cord into receptacle plug where your cable stores.
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Old 04-16-2015, 05:42 PM   #9
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I'm having the same issue. 12V (lights, etc.) is there with generator or AC, but not stand alone. The battery looks new. (I just bought this RV). When I put a meter on it, I got -12.5V. Negative? Sure enough, the red painted wires are connected to the (-) side of the battery. I'm going to switch the battery around now.. if you don't hear from me in a few minutes.. call 911 lol
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Old 04-16-2015, 06:37 PM   #10
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I disconnected the engine battery, no voltage on the house battery leads. Tuned on park power, no voltage on house battery leads. There's no 12V on the battery lug on the converter panel either, with or without park power. So reversing the battery leads didn't fix anything.
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Old 04-16-2015, 09:50 PM   #11
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There is an auto reset breaker just under your corner bed that if open will cause this problem and it is possibly bad. Lift the bed and have a peek, it is inline on an 8 gauge red power cable.
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Old 04-17-2015, 08:02 AM   #12
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I found a black box with a reset button on it, but it's got what looks like AC wires coming in/out of it, not a beefy red battery wire. My battery's out in the barn charging.. I'll put it back in soon and continue t-shooting.

Meanwhile I found these... Repairing Magnatek RV Power Converter

I attached a PDF file that has a ton of info on the Magnatek/Parallax converters. Mine is the 6345 model. Maybe this will help Synthetic. It includes the Repairing Magnatek info, but the link has more updates then the PDF file.
Attached Files
File Type: pdf Magnetek 6300a model 6345.pdf (2.34 MB, 123 views)
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Old 04-17-2015, 09:01 AM   #13
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Quote:
Originally Posted by Synthetic View Post
It's a Class C Four Winds 23a Majestic

Coach battery is brand new and fully charged (confirmed by multimeter)

I get no 12V power inside the coach when unplugged from shore-power. Even the indicator panel does not work (no lights). The same is true even when the engine is running, but I know for a fact that the alternator is charging the coach battery despite having no 12V power inside the coach.

When plugged into shore power, everything works fine and the battery clearly gets charged by the converter.


How can I tell what's wrong or if my converter needs replacing without spending $300 first?!

Thanks in advance.
Follow the heavy bat leads from the converter, there is an autobreaker in that line.
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Old 04-17-2015, 04:01 PM   #14
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OMG... I'm going to kill someone. Not really. I think I found my problem.. after smoking some wires. Yesterday I had the wife push the Emergency Start button to see if the solenoid was working. Nada. So today, I put 12V on the solenoid switch lug to see if it was working. Charged chassis battery, charged coach/house battery, no problem, right? Wrong. It works! I almost called the fire department I had so much smoke coming from under the RV and rolling up through the hood. I disconnected both batteries as fast as I could. Crawled under to see what smoked... the black wire that looks to be going to the fuel tank was partially melted. Oh lovely. I don't know how that's related, but it might help in troubleshooting why the gas gauge hasn't worked. lol


Since I was down there, I traced all the wires, paying more attention to the big monster battery wires. Remember I said the coach battery was installed backwards? And I reversed it and nothing changed? Well.. the wire painted RED went to the chassis, I.E. ground. DOH! The black wire that I had attached to the (-) battery terminal goes to the back of the RV into the frame (from there, who knows?). So whomever put the new coach battery in had the ground and one of the (+) leads in correctly, but the other (+) going to the (-) of the battery. IOW, even after I reversed the battery, there was always a (+) and a (-) lead attached together.

I've left the coach battery disconnected for the time being, waiting for the chassis battery to fully recharge. Oh, and I now have coach lights while running under engine power. Yeah!

The photo shows the red-painted wire. Positive, right? Nope. Ground.

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