Start Switch 3978309

Cummins
Part# 3978309
note
Electrical switch that activates starter motor to initiate engine start.
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Description

The Cummins Start Switch (3978309) is an electrical component that initiates the engine start sequence by sending current to the starter motor. It provides a controlled electrical path to engage the engine’s starting system, ensuring reliable engine activation in commercial vehicle applications.

Key Specifications

  • Application: Tier 3 5.9L ISB/QSB engines
  • Function: Initiates engine start by activating starter motor
  • Compatibility: Commercial diesel engines, heavy-duty trucks
  • Construction: Electrical contacts, durable plastic housing
  • Features: Precise electrical contacts, push start operation
  • Quality: OEM Cummins part

Shipping Info

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More Information

Current Part# 3978309
Part# variations 3978309 CUM,
3978309CUM
Manufacturer Cummins
Warranty Standard Manufactures