seattlejester Posted November 27, 2013 Share Posted November 27, 2013 Howdy, At a garage at the moment with only my phone to look for info. I am trying to ID what the 4 wires coming to the front of the engine bay area. Car is a 1971 240z. I have the wiring diagram, but it gets a little confusing in the distributer area. 4 wires in question they come out of the wiring harness and connect to the distributor area. Black with white stripe Yellow Green with white stripe Black with white stripe (second wire) What I've figured out. One of the black with white wire 12 volt with ignition on (I've been splicing the ignition signal from this wire). Yellow continuity to ground, either power or ground wire. Green with white, I believe this gets power to charge the coil with a full 12v during cranking. No continuity Black with white stripe wire number 2 I think this also gives an ignition signal but during cranking? I guess if anyone knows what the wires do exactly it would be much appreciated. Quote Link to comment Share on other sites More sharing options...
seattlejester Posted November 27, 2013 Author Share Posted November 27, 2013 (edited) I think I figured most of it out. Black with white wire #1 active with key in on position Black with white wire#2 active when key in crank/start position Green and white wire active when key in crank/start position Yellow active with key in on position Both black with white wire I believe is power to the distributor, one is on during the ignition on (second click) and the other is on during cranking, that way ignition is on during both times). Green and white wire is I believe the ballast resistor power to send full voltage to the distributor during cranking. 280zx distributor or newer ignition this is not needed, thus the black wire and the green wire that are both active when the key is in crank position should be tied together. Yellow I am still not sure about. Potentially I think it is direct power to the distributor. Edited November 27, 2013 by seattlejester Quote Link to comment Share on other sites More sharing options...
cgsheen Posted November 27, 2013 Share Posted November 27, 2013 Or maybe the yellow goes to the water temp sender on the thermostat housing. Do you have a Factory Service Manual and a electrical circuit diagram? Download the FSM at xenons30.com for from nicoclub.com/fsm. Get the '72 FSM if you can't find the "1970-1971 Datsun 240-Z Sports" FSM... Quote Link to comment Share on other sites More sharing options...
seattlejester Posted November 27, 2013 Author Share Posted November 27, 2013 Thanks for the reply. I had a condensed diagram when I was in the garage so it was hard to make out exactly what was what, but I have been looking at a blown up one on the computer. I think you might be right about that! When I looked at the diagram the only yellow wires I saw were to the tank unit and the voltage regulator and both of those didn't make any sense. I think if I probably cleaned the wire a bit I will find that it is the water temp wire Yellow with white stripe. So for the future. Coming off the driver side headlight harness is a small bundle of 4 wires in an early 240z. The 4 wires are: Black with white # 1 = 12 volt ignition signal during key on Black with white # 2 = 12 volt ignition signal during cranking Green with white = On with cranking, bypasses the ballast resistor, sends full voltage to the coil during cranking Yellow with white = coolant temperature sender wire, sender grounds through thermostat housing Quote Link to comment Share on other sites More sharing options...
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