Since we are talking about troubleshooting the hydraulics in the tops I thought maybe some people will also need to know where to find info. on troubleshooting the electrical.
Here is some information as to where to find the electrical part of the Z for anyone that might not know.
First click on this link
Index of /FSM/370Z/Coupe (it says for a coupe but the roadster is covered also)
Then select the model year of your car. You will see a list of (pdf) files, find the file (fwd.pdf) & save it. This is a quick reference file so you know what each file pertains to.
For the wiring diagrams it is (pg.pdf) save it also.
Hope this helps.