I had the same problem in my 74' 260z and after several days of wire chasing i found that there are little safety switches that would keep the car from starting unless those conditions were met, ie.. The clutch pushed in all the way, the seat belt fastened etc. All those things are well and good but after 28 years those swithes go bad so i bypassed the whole system and rewired my own starter system with relay.(on my 74' there was no starter relay from the factory) Works every time with no hesitation at all. If you are interested i can give you all the info if thats what you want to do. Let me know. Big John.

 

did you check the fusible links?

 

My '77 have some starting issues. It will not start by turning the key, the only way to start it is to arc the starter or remove the electrical part of the key switch and stick a screw driver in it. The previous owner rigged a switch between the starter solinoid and the battery, If turn on the key and hit the swtich it'll start fine...


Justin T