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Old 04-03-2012, 09:29 PM   #1
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blown fuse

the TT has not been used for about 2 yrs and we got everything ready, hooked up and was on the road for 2 hrs. pulled in for gas and to fix lunch and noticed the lights would not turn on. the 30a fuse at the batt had blown. picked up a pack at auto store and blew 2 more. everything worked fine while we cleaned and loaded up. any ideas? thanks
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Old 04-03-2012, 09:38 PM   #2
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Welcome to the JOF, tigord. Sounds like something is shorted out. You might try flipping off the breakers and one by one flipping them back on to see if a particular load is the cause. I am sure others will jump in with suggestions.
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Old 04-03-2012, 10:01 PM   #3
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If none of the other fuses are blown which I'm guessing they are not cause they would have blown before the main one than the short is between the the main fuse at the battery and the fuse block. Sorry thats not much help but its hard to diagnose this far away.
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Old 04-03-2012, 10:32 PM   #4
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We have a similar problem everytime we unhook power to our trailer the fuse on the battery's blows
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Old 04-03-2012, 11:16 PM   #5
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I had the same problem on our last tent trailer. Found that it only occurred when connecting or disconnecting 7 way to the vehicle with it running. Once I turned the engine off I stopped blowing the 30A at the battery but I still continued to carry extras with me. I also verified that the ground to the chassis had a good tight connection. Hope that helps a llittle.
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Old 04-04-2012, 12:10 PM   #6
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If it had not been used in a while it could have been caused by the battery going dead. I think I remember the old P=IV formula.... (Power in watts = current * voltage).....so as your voltage decreases, the current demand goes up.
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Old 04-04-2012, 08:01 PM   #7
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thanks for all the responses, the tt is about 6 hrs away and we are leaving this weekend to camp for spring break. the batt is about 5-6 yrs old so it would be time to replace. that would be an easy fix to my problem. thanks again!
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Old 04-05-2012, 02:00 AM   #8
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Where is David when you need him? Good call Terry, I don't think I would have thought of that. I have trouble trying to remember Ohm's law.
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Old 05-06-2012, 08:51 PM   #9
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Well folks, the new battery did not fix the problem. I also disconnected from shore power, was not plugged into the tow vehicle and all the breakers were off inside and still blowing the 30A fuse at the battery.
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Old 05-06-2012, 09:08 PM   #10
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Where is David when you need him? Good call Terry, I don't think I would have thought of that. I have trouble trying to remember Ohm's law.
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