I have a similar problem on my 79' 280zx. I was driving one day then it suddenly just turned off on me, popped opened the hood and one of the fusible links on the passenger side was smoking. After that the car would not even crank just a click in the inner passenger kick panel. I tried replacing the burnt fusible link with an inline 30 amp fuse but no luck, just does the same clicking sound. I removed the relay in the kick panel that I thought was the culprit, which I think it was an ignition relay but have now lost it can anyone help with a part number. I think someone mentioned that this relay was obsolete and it now crossed over to a new part number.