1999 Windstar electrical problems
 

I am looking for help with some electrical issues.
it started with no brake light on the left side. no power there although it acts like there is no ground. When is touch my test light to the right side ground terminal wire as displayed on the light socket and i am grounded my light comes on. also the right side signal does not work. i have switched the bulbs and sockets in an attemped to trouble shoot the problem. my chilton manual tells me the ground from all the lights are black but htere is no black wires anywhere. as I have been working on this now the beeper will not shut off at anytime.