Bren,

My dome light hasn't worked since I got the VX. I haven't found any blown fuses & I haven't tried to troubleshoot the fault.

My guess tho is that if you blew a 10A fuse that quickly, you'll blow the 15A too. You'll have to find that short before you can even think of adding the secondary unit in the back. Once that short is repaired, the 10A fuse should be able to handle the extra load of the secondary unit without any problems.

Tom