Understanding the intricacies of your classic Nissan’s wiring is crucial for any restoration or repair project. While Nissan Wiring Diagrams exist, discrepancies between these diagrams and the actual wiring in 69 and 70 models can present significant challenges. This article delves into these inconsistencies, highlighting the importance of accurate wiring information for these classic cars.
One common issue encountered when working with 69/70 Nissan wiring diagrams is the mismatch between the diagram and the physical wiring. For example, the diagram might indicate a Black/White/Red wire running from the ignition switch to the coil. However, this wire might be absent in both the original car harness and new replacement harnesses.
Further investigation reveals more discrepancies. According to several schematics, the wires at the ignition switch should have the following configuration:
- BY: Starter
- BW: Fuse box and resistor
- WR: Alternator, fuse box, and ammeter
- L/R: Fuse box
- BW/R: Coil
However, the reality in both new and existing car harnesses is different:
- BY: Starter
- BW: Fuse box and resistor
- WR: Alternator, fuse box, and ammeter
- W/L: Fuse box (instead of L/R)
- W/Y: Coil (instead of BW/R)
These differences extend beyond the ignition switch. Connector discrepancies at the fuse box, variations in fuse box layouts, and mismatched horn wire colors are just a few examples of the inconsistencies found. Some wires change color at the connector, a detail often omitted from the diagrams. Other wires might be spliced within the harness or simply not present as indicated.
Accurately documenting these variations requires meticulous physical inspection and tracing of the wires within the harness. A comprehensive understanding of the actual wiring configuration is paramount for successful electrical work on these vehicles.
In conclusion, while Nissan wiring diagrams provide a starting point, relying solely on them for 69 and 70 models can lead to frustration and errors. The discrepancies between the diagrams and the actual wiring necessitate a hands-on approach, involving careful tracing and verification of each connection. Accurate, real-world documentation of these wiring harnesses is crucial for anyone working on these classic Nissans. This ensures the proper functioning of the vehicle’s electrical systems and contributes to the preservation of these automotive treasures.
