Standard Ignition RY-785 HVAC Relay

HVAC Relay for Ford and Lincoln Applications

Standard Ignition RY-785 is a 12-volt HVAC relay built for Ford and Lincoln vehicles that use a square, 4-terminal blade-style relay. It is specified for 20-amp service and is a direct replacement option for a wide range of climate-control relay applications, including Ford Fusion, Ford F-150, and Lincoln MKZ models.

Key Features

• 12-volt HVAC relay with 20 A amperage rating
• Square connector shape with 4 male blade terminals
• Composite housing helps protect against heat and under-hood exposure
• Aluminum contacts support durability and long service life
• Epoxy-sealed construction helps resist dust, moisture, and temperature extremes
• Manufactured in TS16949 and ISO9001 certified facilities

Product Details

The Standard Ignition RY-785 relay is built for HVAC control circuits that require a square 4-terminal layout and 20-amp electrical capacity. Its composite housing and epoxy-sealed design help maintain relay integrity in harsh engine-bay conditions, while aluminum contacts are used to support consistent electrical performance over time. This part cross-references Four Seasons 36206 for the same application.

Compatible With Ford Fusion, Ford Flex, Ford Explorer, Ford F-150, Ford F-250 Super Duty, Ford F-350 Super Duty, Ford Taurus, Ford Edge, Ford Transit Connect, Ford Expedition, Ford Escape, Ford Five Hundred, Ford F-150 Heritage, Ford F-250, Ford F-350 Super Duty, Lincoln MKT, Lincoln MKS, Lincoln MKX, Lincoln MKZ, Lincoln Mark LT, Lincoln Navigator, Lincoln Zephyr, and Mercury Milan, Mariner, Montego, and Sable applications where the square 20-amp 4-terminal relay is specified. Standard Ignition RY-785 is also listed with interchange references including Remy 16236.

Common Problems This Relay Can Address

• HVAC blower or climate-control relay failure
• Intermittent relay operation caused by heat or vibration
• Electrical contact wear in a high-cycle relay circuit
• Moisture or dust intrusion affecting relay performance
• Replacement needs for a square 4-terminal 20-amp relay

Installation Notes and Tips

Verify the relay’s square connector shape, 4 blade terminals, and 20-amp rating before installation. Compare the original relay housing and terminal layout to the replacement part, especially on vehicles such as the Ford Fusion, Ford F-150, and Lincoln MKZ where multiple relay styles may exist by year and trim. Confirm the vehicle’s relay cavity matches the OE configuration before swapping the part.

Quality Assurance

Standard Ignition manufactures this relay in TS16949 and ISO9001 certified facilities, with materials selected to support electrical durability and resistance to harsh under-hood conditions. The composite housing, aluminum contacts, and epoxy-sealed construction are used to help maintain reliable HVAC relay performance.