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Old 05-07-2020, 10:43 AM   #1
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2010 27' FB Classic
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Questions about towing without batteries in trailer

I have never taken the batteries out of my 2010 trailer. They seem to still be in good shape but since I won't be traveling during these virus times I will take them out and just put them on a maintainer till I need them again. So that brings me to my questions:
1) Can I still just hook up to the truck and still have lights and brakes just with the 12v electrical cord from the truck?
2) Do I need to separate the battery connections inside the trailer so the pos. and neg do not touch when the trailer is just hooked to the truck.
The reason for my questions are that I may need to get the trailer inspected and will need to tow it to the inspection station and I'd like to tow with no batteries in it. The inspection will not happen anytime soon and the batteries will already be on the bench and not in the trailer.
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Old 05-07-2020, 10:45 AM   #2
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Your emergency brakes via the disconnect switch require you to have an onboard battery to function. If the truck and trailer become disconnected the emergency trailer brakes WOULD NOT function without an onboard battery.
Hope this helps.
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Old 05-07-2020, 10:48 AM   #3
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Thanks forgot about the safety brake.
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Old 05-07-2020, 05:55 PM   #4
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The lack of safety brake while towing pretty much says it all. But I would point out that the inspection is likely to involve inspecting that breakaway switch as well. So it would fail the inspection without the battery.
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Old 05-07-2020, 06:23 PM   #5
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It should be a non-starter due to above, but fyi the lights and things would function through the tow vehicle connection, up to about 20Amps, if you keep the positive post separate and isolated from the frame. It will likely blow the fuse in the tow vehicle if you don't.
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Old 05-08-2020, 10:02 AM   #6
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"Safety First" need the battery for the Breakaway switch as stated above. So don't leave home with out them
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Old 05-08-2020, 02:40 PM   #7
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Good question. Good answers. Thanks for the info.
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Old 05-09-2020, 04:07 PM   #8
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Before you run off to the inspection station, check the top right corner of the license renewal notice. After I had my trailer inspected, my wife noticed “Inspection not required.”

First time in 35 years of towing that I have seen those words.
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Old 05-09-2020, 04:46 PM   #9
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Yep you need the batteries. Especially for your emergency brakes
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