Mopar Cummins Intake Heater Grid Relay

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Mopar 5187880AC 06 To 18 Ram Cummins Intake Heater Grid Relay
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Mopar 5187880AC 06 To 18 Ram Cummins Intake Heater Grid Relay

  • Mopar
$90.98 $119.00
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Mopar 68188370AA 5.9L Cummins Intake Heater Grid Relay Pair
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Mopar 68188370AA 5.9L Cummins Intake Heater Grid Relay Pair

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$78.95 $137.88
Mopar 68393978AB 2019 to 2020 6.7L Cummins Relay Intake Heater Grid

Mopar 68393978AB 2019 to 2020 6.7L Cummins Relay Intake Heater Grid

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Mopar 68188401AA 5.9L Cummins 5.9L Intake Heater Grid Relay

Mopar 68188401AA 5.9L Cummins 5.9L Intake Heater Grid Relay

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$154.98 $172.00
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Mopar Cummins Intake Heater Grid Relay

Mopar Cummins Diesel Engine Intake Heater Grid Relay

What is the purpose of a Mopar Heater Grid Relay?

The Mopar Heater Grid Relays are switches that open and close circuits electronically. The Heater Grid Relay controls one electrical circuit used to power the engine Heater Grid. The heater grid relay controls the opening and closing contacts in this circuit to activate the operation of the heater grid. 

This Cummins engine is equipped with a heater grid relay that activates the heater grid, which is located directly between the air horn and intake manifold. The heater grid heats the incoming air during startup to ensure a quick start in cold weather.

If your Cummins Diesel becomes hard to start or fails to start, it could be the heater grid heater relay. MOPAR and Cummins replacement parts are the same quality as originally installed in your truck. Installing a new heater grid relay is a straightforward process that will restore the heater grid operation for quick starts on cold mornings! 

Warning signs your Cummins Diesel Air Intake Heater Relay needs to be replaced:


  • Longer crank times in cold weather.
  • More frequent crank periods before the engine fires.
  • Increased white smoke during cold starts.
  • A hard-to-start condition is present during cold weather.

The sole purpose of the heater grid is exactly the same as that of glow plugs. To warm the incoming air charge during cold starts. Diesel engines use either glow plugs or heater grids to aid with cold starts.

How else can I help my diesel engine start on a Cold Morning?

Using a coolant heater will significantly affect the time required to start your engine. When you plug in your truck, it heats the engine coolant throughout the engine block. This also raises the engine oil's temperature, making it easier to spin over with proper lubrication rates.