The Exterior fuse was added after serial # F023505

All they did was to put a fuse outside of the box and wire it in parallel to fuse # 12 in the fuse box..
See if there is a fuse in #12..if there is , you have the earlier style..
Key on, of course, when testing
Some of these were also converted by the owners , in which case you want to look at the wires under fuse # 12 for bad connectors..