My friend dropped his new trailer and it cut the harness in half. I spliced it all back together but the flashers don't work. Double checked the splices and nothing is mixed up. Ground is good on the trailer and truck. I removed one bulb and it starts working normally. But when bulbs from left/right are in, even the truck flashers cease to work. Bought a new bulb to replace one that was burnt. When installing it feels cross threaded. I think its shorting out in the socket... Any body have similar problems before?