Question about my 68 fuse panel. In the middle there are three slots with male tangs. Bat, acc, and ign. I gather that obviously these are battery, accessory, and ignition. So, two questions. 1) are they fused; if so to which fuses. 2) if you wire something to the acc. tang will it work in the ign. on position. Checked the wiring diagram and it does not even list these ports. Any ideas??