Ignitions and Electrical› Wiring Harnesses

Wiring

RB25DET Pro Series Engine Harness

$735.00

SKU: WRS-PRORB25-DAT

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In Stock
Ships by Aug 31
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$100 Minimum Order
30 Days Return
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Overview

The Wiring Specialties RB25DET Wiring Harness is a PRO SERIES harness designed for Datsun vehicles with an RB25DET engine swap. It replaces your old OEM harness, offering optimized and 'tucked' wiring for a clean installation. This harness ensures a guaranteed start-up and includes connections for essential engine functions.
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The Wiring Specialties PRO Series RB25DET Wiring Harness is specifically engineered for Datsun vehicles undergoing an RB25DET engine swap. Developed in-house on an actual RB25DET engine, this harness ensures a perfect fit to all engine connections, replacing your old OEM harness to eliminate electrical gremlins. The design exceeds OEM specifications for wire quality and power/ground routing, utilizing an optimized and 'tucked' approach for a clean, worry-free installation with a guaranteed start-up. This harness provides all necessary engine connections, including options for start signal, fuel pump, tach, speedo, and alternator warning light. It can be configured with an optional self-contained pre-wired fuse/relay block for ignition, cooling fans, and fuel pump, or you can utilize your own relays and switch panel. Note that speedo and/or tach signals may require adjustment using a frequency modulator, and aftermarket gauges might be necessary. This harness is not compatible with mechanical cable-driven speedometers. Wiring Specialties offers a variety of customization options for common performance upgrades, allowing you to build a harness tailored to your specific needs. The product is built to order, with most orders shipping within 2-8 weeks, though some options may extend this timeframe.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandWiring
Part NumberWRS-PRORB25-DAT
CategoryIgnitions and Electrical

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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