air conditioner compressor

PLEASE HELP!!
I need to charge my air conditioning system but the compressor is
not running which is necessary for the charging process.
I charged it once this spring and it worked very well. But I
didn't put any dye in it to help find a leak, so of course it
eventually leaked out and now needs more freon r134a. This time I was
going to put the dye in but I'm stuck because the compressor is not
running. I'm pretty sure it's cause the low pressure switch is not
allowing it to run. In my Haynes book it says that this is not uncommon
and is easily taken care of by unplugging the low pressure wire plug
and jumping the wires and the compressor will run continuously allowing
me to fill with freon. The ONLY trouble with this whole thing is that
they don't show me where and what this plug looks like. The last thing
I want to do is start crossing wires and short something out.
If anyone can help I would greatly appreciate it.
Thank You,
Wirespool