New alternator..how many amps is enough? - Team Camaro Tech
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post #1 of 6 (permalink) Old May 24th, 06, 01:45 PM Thread Starter
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New alternator..how many amps is enough?

All I have is head/tail lights, electric fan, radio, and elec. fuel pump. unfortunately I'm not sure on what they all draw. I had a 60 amp and everything "seemed" to work fine..I don't have any other accessories like elect. door locks, A/C, heat, power brakes (if that matters) etc...... How many amps should I go with? 55? 60? 80? 100?

New Jegs chrome 100amp alternator is $99
Duralast 55 amp Reman. with most new parts and LLT warranty is $50.

What to do??
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post #2 of 6 (permalink) Old May 24th, 06, 01:49 PM
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Re: New alternator..how many amps is enough?

No electic fan, pump...a 60 will more than do, and will handle those also.
In saying that I would gofor at least the 80, preferably the 100.

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post #3 of 6 (permalink) Old May 24th, 06, 02:01 PM
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Talking Re: New alternator..how many amps is enough?

This is an area where I like the most I can get. 160 amp alternators are easy to get these days.

Consider this, the typical amp draw of accessories:

Electric cooling fans 15 - 30
Electric fuel pumps 5 - 10
Radio and amps 5 - 10
Head lights 10 - 15
Heater/AC 25 -30

Total 60 - 95

Now consider this, an alternator puts out roughly half of its potenential at idle. A 160 amp unit would put out 70 - 80 at idle. Do the math. I like having lots of power. Just make sure the main wire from the the alternator back to the battery is big enough to handle the load!

If you need a good high amp alternator check these guys out, my preferred supplier:

http://www.motorcityreman.com

1967 Chevelle 496BB/TH400/Dana-60 (Show and Go)
1967 El Camino 388SB/700R4/12-bolt posi (Daily Driver)
1967 C10 Short-Wide 496BB/TH400/12-bolt (The Shop Truck)
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post #4 of 6 (permalink) Old May 24th, 06, 02:25 PM
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Re: New alternator..how many amps is enough?

if your battery stays charged and your headlights are bright, you have a big enuf alternator IMHO





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post #5 of 6 (permalink) Old May 24th, 06, 04:49 PM
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Chris
 
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Talking Re: New alternator..how many amps is enough?

Quote:
Originally Posted by JimM
if your battery stays charged and your headlights are bright, you have a big enuf alternator IMHO
Not always the case! But can be true!

The stock 63 amp Delco's barely cut it.

Another plus to lots of amperage, I nice HOT ignition!

As stated in the original psot, adding a cooling fan will task a stock alternator at idle and the fan will NOT cool properly.

Good Luck!

1967 Chevelle 496BB/TH400/Dana-60 (Show and Go)
1967 El Camino 388SB/700R4/12-bolt posi (Daily Driver)
1967 C10 Short-Wide 496BB/TH400/12-bolt (The Shop Truck)
2008 Harley Davidson Dyna Low Rider


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post #6 of 6 (permalink) Old May 24th, 06, 04:59 PM
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Re: New alternator..how many amps is enough?

Very true Chris.
Also I did not notice he quoted prices for the little as well as the big. If you have to buy one anyway, buy the big one!





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