Understanding your wiring harness can be a daunting task, especially when dealing with aftermarket systems. This guide focuses on deciphering the Ez Wiring Schematic for a Datsun 510, specifically addressing ignition switch wiring and connections to the starter, coil, and ballast resistor. We’ll break down the common challenges and provide clarity on how to properly connect your components.
Common EZ Wiring Challenges in a Datsun 510
Often, EZ wiring harnesses don’t include model-specific schematics, relying on generic US motor diagrams. This can be confusing when adapting to a Datsun 510 with its unique wiring configuration. This guide assumes you’re working with an L16 engine, an MSD coil, an electronic distributor, and an internally regulated alternator, further complicating the process. The lack of a dedicated EZ wiring schematic for the fuse block necessitates a careful analysis of the existing wiring and a thorough understanding of the Datsun 510’s original wiring system.
Decoding the EZ Wiring Harness
Let’s analyze the wires coming from your EZ harness into the engine bay:
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Coil Pos (pink): This wire will connect to the positive (+) terminal of your coil. However, since you’re using a ballast resistor, the connection isn’t direct. We’ll explain how to incorporate the resistor shortly.
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Tach (purple): This wire connects to the negative (-) terminal of your coil.
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IGN START (purple): This wire connects directly to the black/yellow wire on your Datsun 510 ignition switch, initiating the starter.
Distributor Wiring
Your electronic distributor’s ‘T’ connector is wired as follows:
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‘I’ (bottom connection): Connects to the positive (+) side of the coil.
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‘-‘ (top connection): Connects to the negative (-) side of the coil. This configuration ensures the distributor receives the necessary signal for proper ignition timing.
Ignition Switch Wiring Breakdown
The following outlines the connections on your 510 ignition switch:
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Battery Input (Datsun white/red): Connect this to the EZ harness’s IGN SWITCH Power (red) wire.
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Battery Input from Fuse (ON) (Datsun black/white): Connect this to the EZ harness’s IGN SW IGN (brown) wire. This provides power to the ignition system when the key is in the ‘ON’ position.
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Starter Out (Datsun black/yellow): Connect this to the EZ harness’s IGN START (purple) wire, as mentioned earlier.
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ACC/ON (Datsun blue/black): Connect this to the EZ harness’s IGN SWITCH ACC (orange) wire.
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IGN Out (Datsun black/blue): This is where the ballast resistor comes into play. Connect the Datsun black/blue wire to one end of the ballast resistor. Then, connect the other end of the resistor to the EZ harness’s Coil Pos (pink) wire. This setup ensures the coil receives the correct voltage during starting and running.
Integrating the Ballast Resistor
The ballast resistor protects the coil from overheating. With the EZ harness, the IGN SW COIL (pink) wire likely goes through a fuse and becomes the Coil Pos (pink) wire in the engine bay. This pink wire should connect to one side of the ballast resistor, while the Datsun black/blue wire (originally going to the coil positive) connects to the other side.
Finalizing Your EZ Wiring Schematic
By following these guidelines, you can successfully integrate your EZ wiring harness into your Datsun 510. Remember to double-check all connections before testing the system. A clear understanding of the EZ wiring schematic and the Datsun 510’s original wiring is crucial for a successful installation. This guide provides a framework for navigating the complexities of this process, enabling you to confidently wire your vehicle.
