30Amp battery fuse keeps burning

Hi Community, just got stuck on the road with power failure - 30Amp fused... Went to find a petrol station, bought 2 sets of fuses, replace it and immediately fused one spare without key in ignition... No obvious short cut around the battery... Thought it would either be the ignition block or alarm but nothing apparent... could not find useful thread on this... Got a good tip from motorcyclewiring.co.uk highly recommend if you need to redo your wiring... Regulator/rectifier is also connected to + with ignition off...! Didn't know sorry but thought would put it there in case someone else is stuck... Support plate cut through one wire of the regulator/rectifier... Check your support plate for sharp edge...