My 1984 Apencade has Hella driving lights mounted on a light bar under the front fairing. There is only one wire running to each of these lights. Is this the hot wire and if so how are these lights grounded. I cannot get them to work. I rewired everything an installed an inline fuse, but they will not work. The fuse does not blow, so apparently there is no short. Is there a wiring diagram available? Thanks.