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Like 4bye4 I found that my indicators which worked ok with the vehicle solo would blow their fuse when connected to the trailer. A slightly higher rated fuse resolved this. However you have previously towed your float without problem...... so something has changed.
My guess is that you have , as BigCol suggests a momentary short somewhere, most likely somewhere from the plug back to the trailer. When the cable moves, a short occurs & it is enough to cause the fuse to blow. As it is going to be somewhere where wires can move, & the biggest area of movement is around the plug area, this is probably the primary suspect area, but try swiching on your hazards make sure all is working, & whilst leaving them on go around systematically wiggling wires to see if you can make them not work or blow a fuse. Having a mirror or reflective board behind the trailer lights can help to see what is going on.
Intermittent faults are indeed a PIA.
2006 4.2TDi ex-Telstra Remote area Camper. Patrol Sold after 11 years of ownership Replaced with 2006 OKA NT Expedition Truck. Cummins, Allison & lots of goodies A Nomadic Life (Blog)
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