There doesn't appear to be anywhere else that is easily accessible and won't cause a problem if you manage to short it out and take a fuse out. Most of the others are either permanent live or feeding something fairly important. Blowing the cigar lighter and aux power fuse isn't the end of the world but killing something else may well be. Oddly enough, my 1993 Classic LSE had a second cigar lighter socket on the rear of the centre console so back seat passengers could light their cigars from that. That would have ben ideal for you if they had still fitted it on a P38.More later ....... anywhere else you can think of to connect to? I prefer not to take the seat out.