HD Relay: H1/H3

Relay Harness

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HD Relay: H1/H3

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Reality Check: Customers often ask, Do I really need a harness? Yes! A relay harness is designed to deliver steady voltage to your HID ballasts directly from the car battery. Nobody likes a flickering headlight, so why risk it? Factory headlight outputs are really only designed to power a halogen light bub, not an HID ballast.

Don't Skimp: As one of the most important parts in any HID lighting upgrade; don't skimp out when it comes to your wiring. It doesn't matter how good your ballasts are. how good your bulbs are. If your harness is a piece of crap: when it gives out your headlights are gonezo. The Morimoto HD Relay harness is easily worth the premium price compared to cheaper alternatives.

Plug n Play: The layout of the harness makes it easy to install. With just a few simple connections, even your mom could set this thing up! Wire lengths are long enough to be used in everything from compact cars to SUVs and it's designed to be 100% plug and play (no cutting or splicing needed). Its connections are explained in this video.

Compatible: The HD relay can be used for low beams, high beams, or fog lights on most vehicles. The harness uses industry-standard outputs for compatibility with 99% of ballasts out there, and all of the ones we offer here at TRS. Note, if your vehicle has a can-bus system or a finicky pulsed headlight circuit - check out our Standalone Canbus or the Mopar Spec harnesses.

Fail-Safe: Unlike most generic harnesses out there that rely on a single low-quality relay to power both headlights, the Morimoto Harness utilizes one relay per side- so if one did happen fail, you wouldn't be left completely in the dark. Each 40A relay is completely sealed against the elements using ribbed silicone upper and lower seals, and has an flywheel diode for back-EMF protection. Every other connection harness-wide is sealed with the proper silicone grommets. Live somewhere with weather that regularly sucks? No problem.

OEM Grade: Aside from being ahead of the game from a technical standpoint, the HD relay is also a work of art. With it's wiring protected by abrasion resistant Techflex mesh sleeving and OEM-style relay cubes held together by a laser engraved mounting bracket that's been artfully anodized with a titanium gray finish - the HD relay will look factory fresh under the hood!

Trusted: With the Internet's best reputation for unbeatable products, prices, and customer service; The Retrofit Source is trusted by car guys world-wide, so we invite you to Contact Us today with your questions. Whether you need a recommendation on parts, have a tech question, or even a wholesale inquiry: our customer service team is here to help!


What's Included

  • Relay Harness:
    Morimoto H1/H3 HD (1x)
    Weather Pack 40A Cubes (2x)
    Two Years
    TRS Decal
    One Harness Controls Both Headlights


Tech Specs

  • 1x Input Trigger:
    H1/H3 Male
    2x Ballast Outputs:
    9006 Female
    1x 12V Power:
    Nickel-Plated Ring-Type
    2x Grounds:
    Nickel-Plated Ring-Type

DIY Guide

  • 1 hrs Install Time
    • Time to install:
    • 1 hours (estimate)
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Product Reviews

Reviews for: HD Relay: H1/H3

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5 out of 5 stars
Based on: 2 user reviews
Dakota Doerr Reviewed: 11.18.2012
5 out of 5 stars

first time buyer from this site,i like who i dealt with his name was andrew i think he answered me about 5 minutes after i emailed for help and kept emailing me right back till i was satisfied,great customer support,now onto the actual harness it does what its supposed to! lol and its also made of very high quality and looks nice in the bay and doesn't make it look like theres a ton of wires everywhere(because of the jacket)even thought there is.great support great products love you guys

Ethan Gunderson Reviewed: 12.29.2010
5 out of 5 stars

First time buyer from TRS, and must say that I'm definetly impressed. Ordered my H1 relay harness on Friday, and even though Christmas was Saturday, Matt was still able to get my relay harness to me by Wednesday. All the wiring and connections were top notch, and was built with the right size AWG wire. Very impressed and decently priced. TRS pulls through again!