I cannot get my head around what's going on with my left hand trailer indicator. If I take out the bulb I'm getting the full 12 volt signal to the housing - as soon as I put the bulb in I loose the 12v feed. I'm getting 12v to the trailer connector on the back of the pickup ok. Anyone got any ideas what on earth is going on? It's not the trailer - I have another one that has LED lights and it doesn't feed the left indicator either.