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Old 06-05-2016, 09:22 AM   #1
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12 V system

The 12 V system on my 2006 Gulfstream sun voyager has stopped working. Any troubleshooting tips would be greatly appreciated. I replaced the house batteries with new ones but the house 12 V system is still dead.
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Old 06-05-2016, 09:32 AM   #2
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First check the batteries. Assuming they are good then move to the area where the power shut off switch is. Sorry I don't know on your rig. The main switch to shut down house power when storing the rig. Use your volt/ohm meter and make sure you've got 12 volts at that switch, and going out of the switch when it's turned on. The switch activates a relay. So make sure you've got power making it to the relay. Then check that relay. That should get you started.
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Old 06-05-2016, 09:33 AM   #3
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If you are having troubles with the coach 12 volt system only , then perhaps the " Gulfstream " owners forum would be the place to ask. Other owners with your brand , may be sure what kind of battery control center your manufacturer used and how to check and repair it.
Most systems have a master fuse or 12v circuit breaker , and it should be within 3 feet of the coach batteries.
Then there is the possibility of a defective , disconnect relay , or salesman switch.
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Old 06-05-2016, 09:39 AM   #4
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Check the circuit breaker or fuse on your converter/charger/inverter. Check voltage on your coach batteries. What is your remote panel telling you?

When you are plugged into shore power, does your 12 volt system work?

Do you have a generator? See if you have 12 volt system when genny is running.
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Old 06-05-2016, 10:52 AM   #5
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Could you be a bit more specific about "12v system not working"? Nothing at all works (fridge, lights, furnace, etc.), or maybe just some things?

If you are sure that absolutely nothing has 12v power, then the problem has to be between the battery(s) and the 12v power bus (where the fuses are). You probably have a disconnect relay in there, maybe a large fuse (100-300 amps), and of course the cables that connect battery to converter/charger and the 12v power bus. Somewhere in there is an open circuit.
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Old 06-06-2016, 11:16 AM   #6
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Thank you all for the help. The12v system is working again. On my automatic step is not working.
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