Dorman Intake Heater Relay 904-300 for Dodge/Ram Trucks 2008–2018 — Direct-Fit, Durable

If your truck's intake heater relay has failed or shows intermittent behavior, the Dorman 904-300 offers a purpose-built replacement that matches the original relay's fit and function. Designed for Diesel-equipped Dodge Ram and Ram trucks from model years 2008–2018 (specific trims and years vary by model), this relay is built for durable, long-term service and backed by Dorman's automotive expertise. Always confirm vehicle compatibility using the site garage tool before ordering.

How does this relay restore intake heater function?

The Dorman 904-300 replaces the original relay that controls the intake air heater circuit, allowing the heater to engage as intended. Restoring the relay eliminates failures caused by worn contacts, corrosion, or electrical fatigue, returning stable operation to the intake heater system.

• Direct replacement designed to match factory electrical and mounting points
• Re-establishes reliable power delivery to the intake heater
• Prevents intermittent starting issues caused by relay failure

What vehicles and years will this part fit?

This relay is compatible with a range of Dodge and Ram heavy-duty trucks across two model generations. Compatibility depends on engine and trim; use the garage lookup to confirm exact fit for your VIN or vehicle configuration.

• Dodge Ram 2500/3500/4500/5500: 2008–2010
• Ram 2500/3500: 2011–2018 (selected years through 2018)
• Ram 4500/5500: 2011–2017 (selected model years)
• Verify fit by entering make, model, year, and trim in the fitment tool

What are the key features and construction benefits?

Built from quality components, the 904-300 is manufactured to deliver dependable service life under typical operating conditions. The relay is designed for straightforward replacement and is supported by Dorman's parts expertise and quality standards.

• Durable internal contacts and housing for long-term reliability
• Engineered to match OEM fit, function, and mounting
• Manufactured and inspected to meet automotive electrical requirements
• Backed by Dorman support and decades of aftermarket experience

How do I install and confirm the relay is correct?

Installation is typically a direct swap: remove the faulty relay, seat the new relay in the same socket, and test the intake heater circuit according to factory procedures. If you prefer, a professional technician can perform installation and verify operation.

• Disconnect the battery before replacing electrical components
• Swap the relay into the original relay socket and secure firmly
• Reconnect battery and run a functional test of the intake heater circuit
• Use the garage tool to confirm part number compatibility before purchase

Who is this for: The Dorman 904-300 intake heater relay is intended for owners, fleet operators, and technicians working on Dodge Ram and Ram heavy-duty trucks from the listed years who need a reliable, direct-fit replacement for a failed or fatigued intake heater relay. It is well suited for anyone seeking a cost-effective repair part that restores proper intake heater control and helps maintain dependable cold-weather performance when used as part of the vehicle's original systems.