CATEngine Parts

155-3820 Voltage Regulator — Cat C13 C18

This is a voltage regulator that controls the output voltage of the alternator or generator to maintain a stable electrical supply for the engine's systems and battery charging. Manufactured to meet rigorous OEM specifications, it ensures consistent voltage output, unlike a faulty regulator that can cause overcharging or undercharging. Observable symptoms of a failing regulator include a dead battery, dim or flickering lights, and potential damage to sensitive electronic components.

Voltage Regulator – Part No 155-3820 – CAT Spare Part
Part Specifications
BrandCAT
CategoryEngine Parts
ConditionAftermarket — OEM Specification
DispatchSame-day from Mumbai (before 3 PM IST)
GST InvoiceAvailable — all orders
Export DocsCommercial invoice, packing list, COO

Compatible Models

Always verify with serial number before ordering.

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Installation & Application Notes

Inspect mating surfaces for wear before fitting. Use torque specs from service manual. Replace gaskets and seals as a set — reusing compressed gaskets causes oil leaks. Clean all oil passages with compressed air.

Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.

Part TypeVoltage Regulator
MaterialElectronic components and durable housing
ApplicationAlternator/Generator charging system
Service LifeReplace when diagnostic codes appear or charging issues arise
CompatibilityCAT C13, C18, 3406C, 3512B
ConditionNew — OEM specification aftermarket

Failure Symptoms

An initial sign of a faulty voltage regulator might be a battery warning light illuminating on the dashboard. If left unaddressed, the battery may become undercharged, leading to starting difficulties, or overcharged, causing premature battery failure and potential damage to electrical components. The electrical system may become unreliable, impacting equipment operation.

Installation Tip

Always disconnect the battery before replacing the voltage regulator to prevent electrical shorts. Ensure the mounting surfaces are clean and that all electrical connections are secure and properly insulated.

Service Note

Inspect the alternator or generator for signs of wear, such as worn brushes or bearing noise, and check the battery condition when replacing the voltage regulator.