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Old 07-27-2012, 08:30 PM   #1
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No 12 Volt Power

Hi, We just purchased a new to us 2010 Rockwood 2604 travel trailer. I pulled it home, hooked up to AC power and everything seems to work fine. My problem is with the AC disconnected I don't have any 12 volt power in the trailer. I turned on the switch on the trailer tongue near the battery. A voltage check shows 12.7 volts DC at the battery and the switch seems to function properly. The owners manual indicates the switch from AC to DC power is automatic through the inverter. I also checked the circuit breakers and fuses in the converter-O.K. Any ideas?
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Old 07-27-2012, 08:39 PM   #2
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Originally Posted by johng342 View Post
Hi, We just purchased a new to us 2010 Rockwood 2604 travel trailer. I pulled it home, hooked up to AC power and everything seems to work fine. My problem is with the AC disconnected I don't have any 12 volt power in the trailer. I turned on the switch on the trailer tongue near the battery. A voltage check shows 12.7 volts DC at the battery and the switch seems to function properly. The owners manual indicates the switch from AC to DC power is automatic through the inverter. I also checked the circuit breakers and fuses in the converter-O.K. Any ideas?
Check for 12vdc @ your fuse box if you have it at both sides of the switch by the battery, seem like you'd have it if your switch is closed
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Old 07-27-2012, 09:07 PM   #3
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Check for a blown 30A in-line fuse near the battery/tongue.

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Old 07-27-2012, 10:45 PM   #4
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There's most likely a resetable circuit breaker 12 to 18 inches from the battery.
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Old 07-27-2012, 11:15 PM   #5
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Originally Posted by f1100turbo View Post
There's most likely a resetable circuit breaker 12 to 18 inches from the battery.
this usually happens when the battery is installed backwards.
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Old 07-27-2012, 11:16 PM   #6
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this usually happens when the battery is installed backwards.
As we've seen before.
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Old 07-28-2012, 09:32 PM   #7
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Still Having a Problem

Thanks for the responses. I thought I had the problem solved this morning. I found the connections on the circuit breaker under the front of the trailer were very corroded. I cleaned all the connections and my 12 volt power inside the trailer was working Then plugged into shore power and spent the day cleaning the trailer and testing appliances, etc. I disconnected shore power this evening and found the 12 volt power inside the trailer was again not working. I tested the 12 volt disconnect switch on the tongue near the battery. Mine looks like a large key. I found there was continuity across both legs of the switch with the switch turned off or on. I connected both wires together at the switch (bypassing the switch) and the 12 volt power was back up. My first thought was the switch must be bad, but I'm not sure. One question I have is when you are hooked up to shore power the battery is supposed to pick up a charge from the inverter- right? If you have the battery switch turned off as I did today, how does the charging current feeding back to the battery occur? Thanks.
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