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i've noticed that my headlights dim at an idle and volts on my gauge drop below 12. would a 100 amp alt. help? i currently have a 60 or 65? i'm planing on adding an electric radiator fan in the near future.

thanks much, john
 

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I'm not sure if the 100 amp alt will help, but it is a voltage issue not an amp issue (even though they are tied together). Chevy's have a major voltage drop issue, that causes dim headlights, especially if using Halogens.

There is a great artical on this in Hot Rod Mag in either this months or last months issue (I can't remember which) It explains the problem and several fixs for it.

I honestly don't know if the 100 amp would solve the problem, it seems to me that you may still get the inherant voltage drop even with more amperage
 

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This site has some good info on voltage drop and the effect on headlites etc...
There are ways to correct the voltage drop.

http://www.madelectrical.com/electrical-tech.shtml

Certainly running the smallest alternator pulley as possible will turn the alt. that much faster and help with low speed voltage drop.
I upgraded my charging system to a 94 amp SI12 alternator, kept remote voltage senscing, put all my large electrical loads including headlites on relays and installed another isolated + lug on the rad support and take all my large loads off of it, it is connected to my battery and alternator via a 8 guage wire. All my lights are bright now and my electric fan speed is higher.
 

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How much electrical load do you have on your alternator now? If your electrical system is mostly stock ( very little load), you may have a defective alternator. If a diode is dead or a stator winding is open, you will get poor charge at idle.
 

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Wayne could you explain how you did this. We're considering doing this on my sons 70. We're both electrically challenged so the simpler the better. Is pics or diagrams are available that would help to. TIA. Pete and Nicholas
 

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I don't have any pics of my conversion. I did buy the SI-12 94 amp alternator that is speced for a 84 camaro with the 305G motor. I then bought the correct plug for this alternator, I used a combonation of info from this site and the Mad Electrical site. i am comfortable working on automotive electrical so had fun doing it. Here are a couple links that might help.

http://www.chevelles.com/techref/ftecref14.html
Although I did not use the CS130 alternator.

http://207.158.221.52/gw/alt/Alternator_Theory.html

http://www.madelectrical.com/electrical-tech.shtml
Excellant Tech. articles.
 
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