Hunter90

Right where to start if your main beam circuit is popping fuses as you say the it sounds like you have a dead short on the wiring between the switch and lamp not trying to insult your technical knowledge but by dead short I mean a power feed is earthing out ie a chaffed wire start by checking the wiring and plugs for any signs of corrosion or burning out or splits! As for the temp change I had this on my 90 all I did was clean all the main earths and put some vasaline over them once cleaned and replace. Good luck I hope this helps all the best adrian