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Mark73mach1

Correct Alternator Size

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Randy,

 

What would be the correct alternator amp size for my 73 Mustang Mach 1, 351C-4V, FMX, non a/c. I'm not sure if it came with a 42 amp or 55 amp alternator.

 

Thanks Mark


Mark

 

1973 Ford Mustang Mach 1, 351C-4V, Ram Air, FMX, Wimbleon White

1969 Ford Mustang Sportsroof, 445-4V, T-5, Black Jade

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If your car doesn't have power windows or rear window defrost, (and you already said it doesn't have A/C), it would have come with the base 42 amp alternator.

 

-Travis


- Travis

 

 

 

I'm an analog man in a digital world.

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Thanks Doug. I do not have power windows or rear defroster


Mark

 

1973 Ford Mustang Mach 1, 351C-4V, Ram Air, FMX, Wimbleon White

1969 Ford Mustang Sportsroof, 445-4V, T-5, Black Jade

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Randy, If I change from 42a to a 55a alternator what would be the pros and cons? I have a non a/c, non power windows an no rear defroster.

 

Thanks Mark


Mark

 

1973 Ford Mustang Mach 1, 351C-4V, Ram Air, FMX, Wimbleon White

1969 Ford Mustang Sportsroof, 445-4V, T-5, Black Jade

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No cons that I can think of; the only pro would be that if you are drawing more current than the 42a can provide, the 55a would provide it. However, Ford typically built in a 100% margin in their electrical budgets.

 

Remember, alternators only provide current upon demand: they cannot push current to the system.


Let me check your shorts!

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The assembly manual for 1972, dated 04/17/1972, shows 42 amp for Mach 1 302/351 no heated backlite or A/C. Chuck

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Thanks Randy and Chuck. I just remembered that I have changed my headlights over to halogen with a relay. Does that make

any differences?

 

Thanks Mark


Mark

 

1973 Ford Mustang Mach 1, 351C-4V, Ram Air, FMX, Wimbleon White

1969 Ford Mustang Sportsroof, 445-4V, T-5, Black Jade

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OK Thanks Randy

 

Mark


Mark

 

1973 Ford Mustang Mach 1, 351C-4V, Ram Air, FMX, Wimbleon White

1969 Ford Mustang Sportsroof, 445-4V, T-5, Black Jade

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