The black wire comes from the engine where it is switched by a green relay attached to a hose behind the alternator (see picture). This relay is controlled by a small red wire with silver dots and a red connector at the green relay. The red wire?rubbed on a sharp corner and shorted to the engine block (see picture). After fixing the short it still does not work -- the red wire is not getting power when the engine is on.
Any suggestions on what to try next would be greatly appreciated.
thanks
Alex

