DO NOT try and use pin removal tools from generic tool kits or whatnot. You simple slide the safety pin in until it stops, and gently pry downwards so the retainer inside the connector is moved up and away from the contact pin, while GENTLY tugging on the back of the wire. You simply lay the pin flat on the top of the connector contact, and slide it in until it stops. Now insert the safety pin into the small rectangular hole just above the head of each of the contact pins from the INSIDE of the connector. You need to remove this black housing clip to be able to pull the wires out. You do not interact with the seals or poke them at all. All you need to do back here is to be able to see the seals. You must remove the black housing clip on the back of the z31 harness grey connector to expose the seals on the back of the wires. THE COMMON WIRE BETWEEN PRW-2 EQUIPPED CARS and Z31's IS THE BLUE WIRE. THE ONLY WIRES YOU ARE SWITCHING ARE THE BLACK and the GREEN/WHITE wires. The issue with the newer PRW-2 is that there are two wires that have been flipped, or two contacts that need to be swapped on the Z31 harness. On the Z31 harness located on your drive strut tower behind the headlight (where the main ignition components are), you will find your current PTU. (PRW-2, but there is also a similar looking PRW-1A) It can be found on a number of Distributor equipped Nissans It is the transistor that charges/discharges the Ignition Coil. This guide pertains to the following item, it has a number of names: Thanks to michaelp for some help in sourcing diagrams because I was lazyfaced. michaelp said he would take pictures next time he does the upgrade to a customer's car. I'm not even going to post pics or wiring diagrams because the Z31 wiring is the same across all years in this modification as far as I'm aware.
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