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Old 06-13-2010, 11:53 AM
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Is my 100 amp alternator enough ?

Hey guys I have a 100 amp alternator. I am wondering if this is enough for my setup. Here is what I have. I will be running an electric fuel pump,dual electric fans,electric msd 6LS ignition,heater,headlights and no a/c. Would the 100 amp alternator be enough?

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Old 06-13-2010, 12:11 PM
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Quote:
Originally Posted by scapegoat
Hey guys I have a 100 amp alternator. I am wondering if this is enough for my setup. Here is what I have. I will be running an electric fuel pump,dual electric fans,electric msd 6LS ignition,heater,headlights and no a/c. Would the 100 amp alternator be enough?
Fuel pump = 3-4 amps
Dual fans = 12-16 amps
MSD 6LS = 1 amp per 1000rpm (7 amps max)
Heater = 12-14 amps
Headlights (hi/low combined) = 50 amps

These are rough estimates but should be close to actual amp draws. There are more accessories using power than you listed but a 100 amp alt. will work just fine.
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Old 06-13-2010, 12:17 PM
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Great, I was thinking i would be okay but wasnt sure. Thanks.
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Old 06-13-2010, 12:42 PM
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Make sure you have the proper relays for your fan & fuel pump,you may want to check this out:www.watsons-streetworks.com/current_topic.html real good info there! I added the 70 amp relay they advised off the ign switch and the headlamp relays and they really shine bright,also have fuel pump and fan relays.
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Old 06-13-2010, 01:12 PM
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It is just as important to make sure your Battery is sized properly. If the battery is to small you will be replacing that alternator often. The battery is the heart of the system and must be sized properly.
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Old 06-14-2010, 08:19 AM
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I have an 850 cold cranking battery. I also have a 30 amp relay for the fuel pump and a 40 amp relay for the fans. The 30 amp is for sure enough for the fuel pump because i ran it for years with a 30 amp. I researched the fan and a 40 amp is sufficient for low speed which is the only speed im using with it.
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