I'm assuming most load. This would be radar detector in front lighter, DVD player in rear lighter. The S70's have the rear light option, and appears to be wired into the overload relay, and the same fuse. Further, the wiring diagram shows the fuse as both a 15 amp and a 20 amp. Both S70's I have here today do not have the rear cigarette lighter, of course. If you wish, I can attempt to fax a photostat to you, but it probably won't come through very well. I really don't see anything too terribly wrong with piggy-backing it into the ground and power of the other lighter, possibly wiring in a separate inline fuse, to be secured someplace hidden yet convenient, and putting in a 20 amp fuse in the main fuse block. The addition of an inline fuse is probably safety overkill since you have both the overload protection relay (with it's own ground) and the main fuse to save your fanny, but I'd most likely do it. If you take the time to wire it the way the S70 has it, plan on at least 4 hours, as it goes through several connectors, and ties into several fuses.