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Thanks Phil Finally found a readable wiring diagram for a 73 that actually showed the 3 blue wires I have running to the accessory relay and it looks like one eventually one branch changes color and ends up at the ignition switch...I have ordered a new electrical portion of the switch... I also pulled the tach to make sure it wasn't related ...turn out this car was a late enough production that it has the 3 wire tach. Cheers Mark

Hi All Recently acquired a decent running 73 240z (07/73 production date) So I have searched both google and the assorted forums to no real avail. Heres whats up... wiring was a bit of a mess so I am cleaning it up and I came across the two inline fuses on the main dash harness. One is on a white with red tracer wire and the other is on a light blue wire. The red/white one had a fuse in it but the blue one hand a broken apart fuse...so I replaced it...here is where the fun starts. With the blue wire fuse in I can hear a click in the accessory relay..and the weird part is now the starter will try and engage when the key hits the off position. Un hook the fuse (or accessory relay) and its back to normal. I have looked the the FSM wiring diagrams and searched the forums and can't quite figure this one out...Only other thing going on which I guess could be related is that the tach isn't working (haven't pulled it yet). The P.O. did have a pertronix installed at some point. The inline fuse thing and ignition switch has me stumped......Any help appreciated... (I did disconnect both wires to ballast resistor and still had the problem which I think rules out a feedback problem)