on my 04 XE the trailer taillights are inop. brake and turn are fine. using the schematics and diagrams in the TM indicate the current flows thru a 10 amp fuse then trailer tow relay one. my relay/fuse box doesn't have that relay installed. i jumpered across the contacts and still do not get power to the #6 pin in the factory harness. any thoughts? the trailer lights all work hooked to my 66 Elky.