SCORE on alternator !!

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Brooks James

Brooks James

VET, CPT, Huey Medevac Pilot
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Ive been cleaning out all my stuff to sell and forgot that i had this reman alternator, number 4091424 rated at 75 amps, alternator just Tested it at 80 amps.
Question, i have
2 cooling fans
2 fuel pumps
2 igniters for flame thrower
Msd 6al
Halogen ?? Headlamps to replace the old sealed beams.
Will it be enough amps ?

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It might be enough amps but will your wiring support it?

You need to reasearch your devices snd find what they draw in amps or watts and add it all up.

If your spec is in watts devide it by 12 to get the nominal amps.

A = W / V ( 24w / 12 V = 2 A)
 
Dana67Dart said:
It might be enough amps but will your wiring support it?

You need to reasearch your devices snd find what they draw in amps or watts and add it all up.

If your spec is in watts devide it by 12 to get the nominal amps.

A = W / V ( 24w / 12 V = 2 A)
Click to expand...
I went overkill on wire size the only relay is for the starter, all else is fused
Thanks for the formula
 
Get a minivan alternator and press on a v pulley, 160A out the door and are internally
regulated. must adapt it but looks easy
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You might get 80A out of that squareback....
 
You might find that under idle with the fans kicking in it will draw quite a few amps . You are running relays with the fan& pumps ? and the msd will require full 12 V. I found with mine running a single fan electric pump 6AL with the Sniper setup with a 70amp setup would draw too much @ idle dropping voltage to 10.00-10.5 and I have no radio all my lights bar head lights are LEDs I ended up with a power master 95amp now under idle wth everything running 13.5 13.8v.
 
What you list is under 80A. The halogens are most 55w (maybe) at 13.5v is only ~4 a side. Those electric fans have a high inrush start current but still can draw that from the 500A battery. Running is no big deal. The MSD is supposed to take .7-1 amp every 1000 rpm? Pumps are like 5A
 
67 gt said:
You might find that under idle with the fans kicking in it will draw quite a few amps . You are running relays with the fan& pumps ? and the msd will require full 12 V. I found with mine running a single fan electric pump 6AL with the Sniper setup with a 70amp setup would draw too much @ idle dropping voltage to 10.00-10.5 and I have no radio all my lights bar head lights are LEDs I ended up with a power master 95amp now under idle wth everything running 13.5 13.8v.
Click to expand...
At 1300 shaft RPMs of a CS144 alternator (140A) its putting out 50A and at 2000, its putting out 95A and pulling away from there. Idle at 700 RPM at a 2:1 alterantor pulley is 50A at idle. A huge double truck fan @ 4600CFM pulls 28A at full tilt (way less at the controllers min) MSD pulls <2A at idle, Fuel pump pulls 4A MAX (Holley sniper) and the Sniper itself has a 15A fuse so what maybe 8A max? LEts say those LED headlights pulle 5A (huge for LED) Thats under 50A right there...I wonder where you were losing enough to sap 3V out of your battery? Even a squareback could handle that. Mystery......
CS144.jpg
 
Just please make sure you at least inspect the wiring to make sure it can handle the increased load. The last thing you want is a pile of ashes.
 
RustyRatRod said:
Just please make sure you at least inspect the wiring to make sure it can handle the increased load. The last thing you want is a pile of ashes.
Click to expand...
When i found it how much harnesses cost i did my own wiring, larger gauge than stock by far
 
Brooks James said:
When i found it how much harnesses cost i did my own wiring, larger gauge than stock by far
Click to expand...
Yeah, it ain't cheap, unless you use one of those universal harnesses based on GM colors. ...and then you have to be careful because you can still end up with a piece of **** harness.
 
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