Originally Posted by NoTLaDStyle
if the positive is direct to battery I woul ddefinitely look at the ground for the problem - are you using any crimps in the wire? if you are try soldering the connections all the way through.
I had a guy come by my shop with a similar problem. Turns out he grounded it to the trunk 'arm'...the part that holds the lid up, and moves up and down when you open and close the trunk. It only made a good ground when the trunk was up, and the arm touched the truck edge.
Like Dalton said...check the ground.
Toby