MaxxECU PDM20 Harness

All harnesses for MaxxECU products ship free of charge via UPS ground, with additional insurance to cover the total cost of a lost or damaged harness, at no additional cost to you. We support our customers, and will always do what is needed to make any issue right.

Reach out to us about discounts for more than one harness, or business-to-business sourcing. If you are a business and need to order tax-exempt, please set up a login account and then email us with the Google Maps link to your business, as well as a contact person to speak to. We will quickly call and verify your business, and then set your account to order products tax-exempt. Qualifying businesses are performance shops, retailers in a related field, and repair servicers.

What you get with your order:

• Holley HP EFI connectors, sourced from the original manufacturer

• Pinned circuits designed specific for Holley HP EFI systems, no guesswork involved

• A pinout sheet that shows the color of each circuit with circuit description

These are made-to-order unterminated harnesses for the MaxxECU PDM20. Our process allows you to select the length and wire type to fit your budget and needs.

Base harnesses are 10 feet long and made with OEM-grade automotive wire (copper, 125°C rated insulation), with 15 foot length optional, and even longer harnesses available per custom order. Email us if you need a custom length.

We offer M22759/16 military-grade wire, which is tinned copper, with insulation rated for 150°C, and it is more abrasion resistant for professional motorsport applications, which is available as a wire option, but is an increased cost. No matter which wire is used, always avoid routing near turbos, exhaust components or other major heat sources without proper shielding.

These harnesses are meant to last the life of your vehicle.

Please note that custom harnesses are displayed at $1,000, but that is just a placeholder required by our e-commerce system. Custom order pricing is determined over email, and then our website price is adjusted to allow you to place your custom order at the agreed upon price, which will be lower than $1,000. This is easier for our customers than direct invoicing.

We use original parts produced by the connector manufacturer defined by MaxxECU, always purchased from authorized distributors to ensure the best product quality and performance. All terminal interfaces to the ECU are gold-plated for superior connection quality and reliability.

We keep an inventory of materials ready to produce one piece of any harness for emergency turnaround needs of our customers, with our regular order lead times being under two weeks. If you have an emergency situation, contact us via email before placing your order and we will work with you the best we can at no additional cost, excluding expedited shipping if that's what you request.

We CANNOT help you with technical questions related to the aftermarket PDM or harness installation. We are happy to support any issues with our product, but we do not have resources at MaxxECU to support your vehicle build.

If you receive a harness and determine that there is an issue with the manufacturing of the assembly or damage from shipping, we will repair the product and ship it back to you. If you cut circuits during your installation before requesting a repair, those circuits will not be replaced during the repair of the defect. If you need circuits replaced, please reach out to us directly to work together, and your needs will be met at the lowest cost possible.