Speed Demon H1 Wiring Harness & Switch (Single Light)

Speed Demon H1 Wiring Harness & Switch (Single Light)

Marsoni

M251S

$39.00

Get it in 3 business days with 1 day shipping. Friday, May 29

Speed Demon H1 Wiring Harness & Switch (Single Light)Universal Plug and Play Wiring Harness with On Off Switch. For use with 1 light with a maximum 120 watts. Compatible with all lights 2 pin Dt connector for 1 Light Easy Installation Guide Works with all Speed Demon Lights up to and including 120 watts. Set includes Wiring Harness & Switch 30A 12V DC Relay

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Good value for the quality of these copper cables. Cut them to the length I needed and put a copper eyelet on one end. Wire size works good between my Victron solar charge controller and the batteries. Wire gauge will be able to handle the wattage much better than what I was using. They look much more professional than the old cables I was using also!

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Reviewed in the United States on December 15, 2025

Verified Purchase

Amazon Customer

Boise, US

★★★★★ 5

Be safe and always calculate the gauge wire are you need, don’t cut corners.

Size: 4 Gauge 10FT

Good quality solid copper 4 Gauge wires in red and black. Avoid aluminum wiring that has copper plating so looks like solid copper but can be dangerous if used in heavy load applications. Copper is expensive but required if amperage is high.

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Reviewed in the United States on February 8, 2026

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Jenaro Garcia

Boise, US

★★★★★ 5

Good

Size: 1/0 Gauge 10FT

Good item

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Reviewed in the United States on April 14, 2026

Verified Purchase

Hunter

Omaha, US

★★★★★ 5

Works no issues

Size: 8 Gauge 10FT

Works no issues

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Reviewed in the United States on May 7, 2026

Verified Purchase

TJ Helser

Lake Worth, US

★★★★★ 4

Durable insulation and pure copper not that cca bs

Size: 1/0 Gauge 5FT

Good quality. Solid copper, not that cca bs. Stiff and durable insulation. Used for big 3 car audio grounds on high output alternator. Great results. Will mention that it’s not as thick as some other brands but not by much. Terminals still crimped tightly with 1/0 gauge

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Reviewed in the United States on January 11, 2026