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.
My advice would be to get the relay, and then if problems still persist, see the dealer. You will limit his excuse of you "not having the right equipment". I have heard some other issues like this. My 04 didn't have this issue. I bought the factory hitch which came with all relays, etc. It could be current draw. I assume that you have checked fuses, etc.