Fuse Blows When Towing - Page 2 - Fiberglass RV


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Old 04-03-2015, 01:59 AM   #15
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Talking Good analysis

Steve gave good advice.

This illustrates a principle I think is good to follow: INTOW

I Never Trust Other's Work.
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Old 04-03-2015, 02:13 AM   #16
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Hmmm I may have given inaccurate info then. The only reason I know the fuse is blown is that I have no power to the trailer. But when the tow vehicle is disconnected it doesn't blow. Only when I hook up, drive, then disconnect and go to use power in the trailer, nothing will work. I think having a RV tech look at it is my best bet. I swear after the line burned back from the previous owners wiring nightmare that I only took out the portion going to the lighter receptacle and then put the inline fuse coming off the battery.
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Old 04-03-2015, 04:26 AM   #17
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I would suggest that replacing the fuse with an ammeter and starting the tow vehicle could destroy the meter. Most DMM's have 10-20 amp maximums and are not fused.

I would be surprised if the charge line is shorted but a simple voltage measurement at the 7 pin charge line contacts on the tow vehicle will tell you. You can't have a voltage across a short.

Tim, did you get the battery tested? Is there a breaker in the charge line at the tow vehicle battery? Raz
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Old 04-03-2015, 04:30 AM   #18
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I haven't had the battery tested. It's still in storage (but not for much longer!!) I haven't seen a breaker or fuse in the charge line unless it is hidden somewhere in the tow vehicle. Definitely need to do some more investigation and follow the lines to see where they go.
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Old 04-03-2015, 04:40 AM   #19
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Did you have the vehicle wired or was it wired from the factory?
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Old 04-03-2015, 04:45 AM   #20
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I think the previous owner did a fair amount of "tinkering" And I did some myself after it burnt up from the battery to inside the cabin. But all I did was replace the burnt sections and put the inline fuse to hopefully prevent it from happening again.
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Old 04-03-2015, 04:47 AM   #21
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Who wired the tow vehicle?
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Old 04-03-2015, 04:56 AM   #22
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That was from the factory. 2012 4Runner. The brake controller was a simple plug in.
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Old 04-03-2015, 05:14 AM   #23
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No need to look for a breaker. It will be there. Factory wiring makes the tow vehicle less of a suspect. I doubt it's start up current either. Most factory wired vehicles have a relay to isolate until the tow is running. The trailer umbilical is where I would look next. That is, after you check the battery. Do let us know when you find the problem. Raz
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Old 04-03-2015, 05:18 AM   #24
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Will do. Thanks for your input!
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Old 04-03-2015, 07:40 AM   #25
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Check the polarity of the cables to the trailer battery. If they are reversed it will blow the fuse when you hook it to the tug.
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Old 04-03-2015, 09:49 AM   #26
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Quote:
Originally Posted by Larry,C View Post
Check the polarity of the cables to the trailer battery. If they are reversed it will blow the fuse when you hook it to the tug.
Yup. If the umbilical is wrong, the fuse goes. If the battery is wrong, not only will the fuse go but all the fans will turn backwards too. Either way the battery sees a short when you plug in. Raz
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Old 04-03-2015, 03:50 PM   #27
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If that is the problem, at least it would be an easy fix! Of course I could never show my face again from embarrassment!! :P
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Old 04-03-2015, 04:01 PM   #28
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If it makes you feel any better, guess how I came up with that as a possible solution...
Oh crap now I can't show my face.
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