Thanks for the info.
In my trailer, this circuit is the purple wire, and I have had the same problem. I found that the fuse panel was heating up to the point of damaging the purple wire that connected to it. There doesn't appear to be a short, but the fuse does keep blowing, as you are experiencing.
I have the original Univolt converter, and I strongly suspect that the metal fuse holders in the fusebox on it have deteriorated and since they will not keep enough tension on the fuse to maintain a good connection, the loose connection increases the resistance, it heats up the fuse, which then blows.
This is only conjecture on my part so far. I purchased a new converter and fusebox late last year and I mean to install them when I can get back to the trailer in May.
I also read on here that not having a battery installed in the circuit can cause problems with the Univolt's operation, which is why I asked you if you have one.
Good luck with your problem, and please post any information if you manage to repair the fault.
cheers,
Aage
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“Courage is being scared to death, but saddling up anyway.” ...John Wayne...........................
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