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Old 04-17-2019, 01:55 PM   #1
dynaco1
 
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Default M60 250A alternator on gas VS. M46 220A alternator on diesel

The new gas engine comes fitted with a 250A alternator. Whereas, the diesel comes fitted with a 220A alternator.

I wonder why? Any theories? What is M47?


M60

A high-output alternator rated at 14 V/250 A is fitted instead of the standard alternator, and only in conjunction with code M47, alternator for fuel economy.

Benefits:
 Improves efficiency
 Increases output
 Reduces noise
The more powerful alternator increases the performance of the electrical system. It ensures that the increased power requirements of additional electrical equipment are met. It also ensures fast battery charging in vehicles frequently used on short-distance trips and at low temperatures.

M46

Standard high-capacity 14 V/220 A alternator. This alternator is automatically specified in conjunction with six-cylinder engine.

Benefits:
 Improves battery charging in short-distance operation
 Enhances electrical system performance
The higher-capacity alternator enhances the performance of the electrical system in vehicles such as ambulances or fire-fighting vehicles. It meets the power requirements of high-consumption electrical auxiliaries such as tailgate lifts. It also ensures rapid battery charging in the case of frequent short distance operation and operation in cold temperatures.

Last edited by dynaco1; 04-17-2019 at 01:58 PM.
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Old 04-18-2019, 03:23 AM   #2
Boxster1971
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Default Re: M60 250A alternator on gas VS. M46 220A alternator on diesel

Code M47 was first available when the 4-cylinder diesel was offered in USA/CND. It is a data driven system that uses a network to monitor the battery SOC (State of Charge) and electrical loads. When it determines the battery is fully charged and the electrical loads are light it reduces the alternator output to save fuel.

Member "avanti" has mention this alternator system several time on this and the B-van forum.

Form my use I'm interested to know if upfitters will be able to add a second alternator on the M274 4-cylinder gas/petrol engine.
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Old 04-18-2019, 03:35 AM   #3
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Default Re: M60 250A alternator on gas VS. M46 220A alternator on diesel

These articles are a brief explanation of the LIN protocol that is apparently used in the M47 alternator option.

https://www.testmyalternator.com/en/...mmies-tma.html

https://www.embedded.com/electronics...ator-Regulator
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