Free Shipping
Orders $99+ · Lower 48 U.S.
Easy Returns
30 days to decide
1-Year Warranty
Manufacturer-backed
Check Fitment
Find your bulb size
Delivered-price matching
DDM Tuning Delivered-Price Match
Found a lower delivered price from DDM Tuning, including their 10% new-customer offer? BRI Source will match the pre-tax delivered price on the same eligible product and configuration.
Current product
DDM Tuning - Dual Relay Harness
Default Title
Requirements
- The comparison must be from DDM Tuning’s official website.
- The product must be identical and currently in stock.
- The bulb size, wattage, color temperature, decoder option, quantity, and other selected options must match.
- The comparison must include DDM Tuning’s standard shipping charge to the same lower-48 delivery ZIP code.
- A current cart or checkout screenshot showing the product, discount, and shipping charge is required.
- The offer cannot be combined with another BRI Source product or order discount.
- Clearance, open-box, marketplace, expired, and obvious pricing-error offers are excluded.
- Price matches must be requested before purchase or within 24 hours after the BRI Source order is placed.
- Limit one DDM new-customer offer match per customer.
Include with your request
Your delivery ZIP code, the DDM discounted product price, DDM’s standard shipping charge, and a current DDM cart or checkout screenshot. The sales contact form does not upload files, so send the screenshot when our sales team replies.
Before you order
- Confirm your bulb size and factory headlight package.
- Some vehicles may require CANBUS or anti-flicker modules.
- Some LED/HID upgrades may be intended for off-road, show, auxiliary, or permitted-use applications only. Check local laws before using upgraded forward lighting on public roads.
You may also need

The DDM Tuning Dual Relay HID Harness uses dual input relays that will connect to both the left and right side of the vehicles wiring. It's designed so both relays send power to both lights. What does this mean for you? If in the extremely unlikely even 1 relay fails, both lights will still function as normal and you won't be left in the dark.
Designed to supply proper current and voltage to the HID system by using the stock wiring as a trigger for the relay. Plug and play use with all DDM HID kits (as well as most on the market).
Use this relay harness to connect HIDs to cars with very small gauge wiring that cannot supply the initial surge current required to light the bulbs reliably. Symptoms indicating the harness is required would be intermittent starting or lights going out after being turned on for several minutes and requiring you to turn the lights off and back on for them to turn back on again
Power is drawn through TWO 40A relays to allow both ballasts direct power from the battery through a fused power wire.
- When using a 55W HID kit
- If the bulbs being replaced are also the DRL's (Daytime Running Lights)
- Older Vehicles (pre-2000)
NOTE: This harness is not needed when installing a High / Low HID kit.
Wire length from relay:
Power: 32 inch
Ground: 7 inch (grounded at each output)
Input / Output 1: 18 inch
Input / Output 2: 68 inch
NOTE: This harness is not needed when installing a High / Low HID kit.
The wiring is protected by a durable mesh covering to protect against wear.
Included: One (1) Dual In Dual Out Relay Harness to power both sides of the vehicle
Warranty: 1 Year