How many amps is the alternator on a 6.7 Cummins?
The typical factory alternator on most 6.7 Cummins engines is 160 amps, with higher-output options around 210–220 amps and some heavy-duty configurations reaching up to about 260 amps.
The amperage can vary by model year, trim level, and whether the truck uses standard electrical charging or a factory high-output alternator designed for heavier electrical loads such as towing, plows, or aftermarket accessories.
Typical amperage ranges for the 6.7L Cummins
These ranges cover the most common factory configurations you’ll encounter in Dodge Ram 2500/3500 trucks equipped with the 6.7L Cummins. Always verify for your specific vehicle, as options changed over time.
- Standard factory alternator: typically 160 amps (used on many mid-to-late model year configurations).
- High-output option: typically 210–220 amps (found on several high-demand or tow-focused setups).
- Very high-output or aftermarket/high-demand setups: up to around 260 amps in some heavy-duty configurations or specialized packages.
When planning electrical work or upgrades, confirm the exact rating for your specific truck by checking the alternator label, part number, or your vehicle’s documentation.
How to verify the alternator rating on your 6.7 Cummins
To confirm the exact amperage for your vehicle, use these steps.
- Inspect the alternator label on the unit itself for the amperage rating or part number.
- If the label is unreadable, read the part number stamped on the alternator and cross-reference it with the manufacturer’s documentation or a parts lookup.
- Check your vehicle’s window sticker or the service manual for the original equipment specification for your exact model/year.
- When in doubt, contact a Ram dealership or Cummins service with your VIN to get the precise amperage spec for your truck.
Note: Some aftermarket or remanufactured alternators may have different outputs, so always confirm the installed unit’s rating if you’re changing or upgrading components.
Summary
In most 6.7 Cummins applications, the standard alternator is around 160 amps, with higher-output options typically in the 210–220 amp range and some heavy-duty configurations reaching up to about 260 amps. Always verify the exact rating for your specific vehicle year and configuration, especially if you’re upgrading electrical load or replacing the alternator.
How many amps is a f250 alternator?
The alternator produces a maximum of 300 amps and will produce a minimum of 170 amps continually at low idle speeds and maximum output above 1800 engine RPM.
How many alternators does a 6.7 Cummins have?
A standard 6.7L Cummins engine has one alternator, but some heavy-duty or modified applications, particularly for high-demand electrical systems, can be equipped with a dual alternator setup that includes a second, secondary alternator.
- Standard configuration: Most 6.7L Cummins engines are equipped with a single alternator from the factory.
- Dual alternator setup: Trucks running numerous high-demand accessories, secondary battery banks, or used for commercial purposes may have a second alternator installed. This is often an aftermarket modification, though some factory-equipped dual-alternator provisions exist.
How many amps is a stock alternator?
A stock alternator typically ranges from 65 to 100 amps, though this varies significantly based on the vehicle's make, model, and year. Smaller cars may have as little as a 60-amp alternator, while larger engines or diesel vehicles might have higher output, sometimes around 140 amps or more. To find the exact rating for your vehicle, check the alternator itself for a stamped number or look up your specific model's specifications.
- Typical range: Most stock alternators are rated between 65 and 100 amps.
- Smaller vehicles: Some smaller or older cars might have lower ratings, such as around 60 amps.
- Larger/diesel vehicles: Vehicles with larger engines or diesel engines often have higher-output alternators, sometimes exceeding 100 amps.
- How to find yours: The most accurate way to determine your specific alternator's rating is to find the amperage number stamped or printed on the alternator itself. You can also find this information by checking your vehicle's VIN with a dealer or consulting a service manual.
What amp alternator is on a 6.7 Cummins?
The amperage of a 6.7L Cummins alternator varies, with stock alternators typically being around 145-220 amps, while high-output aftermarket units can range from 240 to over 375 amps. The exact amperage depends on the vehicle's model year and if it has a stock or upgraded alternator.
Stock alternators
- 145 amp: Some older models may have a 145 amp alternator from the factory.
- 220 amp: Newer models are often equipped with a 220 amp alternator from the factory.
High-output aftermarket alternators
- 240 amp: Common high-output option.
- 300-375 amp: Available from manufacturers specializing in high-output alternators for diesel engines.
