I was just poking at black gold man's response. He likes to post those Google links.
Sorry I couldn't be more help. Personally, I like to take an ohm-meter and measure resistance on the component or system I'm looking at, or measure voltage drop if it is powered constantly. If you find an issue then you can focus on that area.
I know this isn't an answer but if you have a hard copy fsm it will have a color coded wiring schematic in the back. Mine is a 4 page foldout that shows all the electrical system grounds. You have to still find them on the car but if you know one is in a certain area you will be able to find it.
sorry if my sarcasm came off as being rude. its been a frustrating last couple of weeks trying to rebuild my fuel pump. good news is the car runs like a champ now. the inlet screen was a little clogged,(thats why i took it off in the first place) and had trouble putting it back together the correct way. the spinny things kept hitting the side of that plate so i had to hook it to 12V to make sure it pumped ok. all is good in the z world for now. i just wanted to clean ALL the connections and grounds cause you guys know how crazy the electrical systems are on these cars. one bad connection and everything's all out of whack.