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SR20DET Swap Wiring Guide

This wiring guide is for swapping an S13 SR20det motor into the S13 240SX chassis. It's actually not as difficult as many may think. Following the SR20det wiring diagram below will get you up and running in no time.

Before you get started, make sure you have the following tools and supplies handy to make the sr20det swap wiring a smooth process:

  • Wiring Electrical tape
  • Wire Strippers and Cutter
  • Soldering Iron and Wire Solder
  • Heat Shrink Tubing
  • Heatgun or Lighter

Heat shrink tubing and a heatgun is optional, but gives the modifications a professional touch and is less prone to potential future problems.

The first modification required is replacing the SR dash connector with the stock KA dash connector. The SR dash connector (white, as shown in Figure 1) will not mate with the KA dash harness, so it needs to be replaced with the KA dash connector. Cut both the SR & KA dash connectors, and wire the KA one to the SR harness using the table & wiring color guide below.

Connect the wires according to the table below:

SR Wire Color KA Wire Color Function
Black (may be more than 1) Black (may be more than 1) Ground
Blue / Green Stripe Blue / Green Stripe AC Signal
Blue / Black Stripe Blue / Black Stripe Water Temperature Signal
Orange Orange Ignition Start
Yellow / Red Stripe Yellow / Red Stripe Tachometer Signal
Yellow / Green Stripe Yellow / Green Stripe Speedometer Signal

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Engine Specifications:

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