Turn signal indicator ?

[bob]

The truck is a 1995 K-1500 w/350. The right turn indicator on the dash, lights up when the brakes are applied. The truck has been wired for a 4 way plug for towing. I think the gremlin might be in there, but I'm not sure.

[xcopterdoc]

bad ground.. power is back feeding. Check trailer ground, trailer light assys for a good ground and make sure you have the white wire on the truck grounded good.