914Rubber Alternator Wiring Harness for Porsche 914 (1970-76)

PMB Performance has been the premier source for Porsche 914 parts for 20 years, proudly partnering with 914Rubber to offer more of their SKUs than any other retailer. Our deep knowledge of 914 electrical systems ensures you get components that deliver reliability and performance. The 914Rubber Alternator Wiring Harness (Part No. 021971349D) is a meticulously crafted reproduction for all Porsche 914 models (1970-76), designed to restore clean power delivery to your alternator circuit.

This harness is built with 10-gauge oxygen-free copper wire for the main alternator-to-starter lead, ensuring low resistance and efficient current flow—critical for the 55A Bosch or Motorola alternators used in 914s (1.7L, 1.8L, 2.0L, and 914/6). The harness includes two high-temperature silicone grommets to protect against chafing where the wires pass through the engine tin, plus OEM-style bayonet connectors for a plug-and-play fit. Unlike brittle factory harnesses that crack after decades of heat exposure (up to 250°F near the alternator), this reproduction uses cross-linked polyethylene insulation, rated for 300°F and resistant to oil and vibration. One harness is required per car.

Installation is straightforward but requires precision. Disconnect the battery, remove the old harness, and route the new one through the engine tin, ensuring the grommets seat securely to prevent air leaks that could disrupt cooling. The main lead should reach the starter without excessive tension—some owners note it could be 1-2 inches longer for easier fitment, so plan your routing carefully. Inspect the alternator’s D+ and B+ terminals for corrosion before connecting to avoid voltage drops. For reference, check 914Rubber’s Tribal Knowledge Wiki video for visual guidance.

Why PMB and 914Rubber? We’ve rebuilt 914s for street, track, and show, so we know a failing harness can lead to charging issues or worse—electrical shorts. This harness, backed by 914Rubber’s quality and our unmatched inventory, ensures your alternator keeps your 914 running strong.