I've recently had to re-wire my trailer. So far everything seems to bee working except one thing. Parking lights- ok / rt turn signal - ok / lt turn signal - ok / brake lights don't work. When I apply the brake on my truck the truck brake lights work, but my trailer light go out. When the brake is un-applied the parking lights come back on. a few notes. The light bulbs are double filament lights. The light bulbs are installed correctly The light bulbs are not blow. Any suggestions??