Alternator Help
Thread Starter
Drifting
Joined: May 2004
Posts: 1,258
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From: Huntsville Alabama
Alternator Help
Yes i did a search and found nothing that suited what i was looking for. Well last night my 100amp summit alternator decided to take a crap. I need to know what alt that is 100+ amps will work. Its a 75 small block. I have dual electric fans, hella 90mm headlights and hella ff50 driving lights, Subs and Stereo. I need at least a 100 amp alt and it needs to be a 1 wire hook up because thats the way its installed when i installed the ez wirining harness last summer. Thanks in advance.
Last edited by Silver00V6Camaro; Mar 24, 2007 at 12:46 PM.
Team Owner
Joined: Aug 2006
Posts: 24,125
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From: Columbia Missouri
Here, this paper will walk you through the whole thing. Keep in mind you can use a CS130 or a CS144. If you go with a CS130, post that, so I can walk you through the process of modifying it for better air flow.
http://photos.imageevent.com/durango...%20Install.pdf
A CS alternator will give you 100+ amps, and always more amps at idle, over the SI alts. Even the high amp jobs still have sucky idle amps.
For what you need I suggest the CS144. It will give you around 100 amps at idle, and around 140 at RPM.
http://photos.imageevent.com/durango...%20Install.pdf
A CS alternator will give you 100+ amps, and always more amps at idle, over the SI alts. Even the high amp jobs still have sucky idle amps.
For what you need I suggest the CS144. It will give you around 100 amps at idle, and around 140 at RPM.
Thread Starter
Drifting
Joined: May 2004
Posts: 1,258
Likes: 0
From: Huntsville Alabama
Are these 1 wire. I do not have a factory wiring harness I have a ez wiring harness. I need a 1 wire application. After reading through your write up can these alts be made in to a 1 wire I do not have the gen light in my car anymore I have full autometer gauge setup.
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Are these 1 wire. I do not have a factory wiring harness I have a ez wiring harness. I need a 1 wire application. After reading through your write up can these alts be made in to a 1 wire I do not have the gen light in my car anymore I have full autometer gauge setup.
Yes. You need an inline resistor and some can be bought AS a single wire application.
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
No. The whole thing about the GEN light is that the bulb provides resistance for that brown or white wire that goes to the alt to tell it to charge. That's the one wire, and that's the important part to remember. Without resistance in that line the alt will never charge properly. Your kit may have included this somehow.
What you can do, is wire everything the way you have it. Take your one wire, spliced into a CS alt plug, and start the motor. Test the amt to see if it's generating 14V or if the engine is running off of the battery.
If it's not generating, add a resistor.
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Team Owner
Joined: Aug 2006
Posts: 24,125
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From: Columbia Missouri
I would search Ebay. They advertise them as one wire. I bought one by accident. They really are not very different. The second wire is just from the harness, and all it has is a constant 12V from the battery that I tie in with the BAT terminal on my installs. The third is a ground, and the forth is the BAT wire that goes to the BAT terminal.
I could be wrong but any CS alt will work on your one wire system.
Melting Slicks
Joined: Feb 2001
Posts: 2,608
Likes: 3
From: TEXAS - you mean there are other states?
I will check on the difference between CS and SI, but what happens to all the amperage if he does not use it - is there any detrimental issues with excess amperage? I ask also because I need to upgrade my alternator now - ready to make a purchase.
Team Owner
Joined: Aug 2006
Posts: 24,125
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From: Columbia Missouri
There is no excess. That amperage is only generated as it's needed. If you have no lights, no fans, no nothing running, the alt will barely be generating anything...just enough to run the ignition system.
When everything is on, the system needs more juice and that one wire tells the alt, "Hey, lets kick it up a notch."
Melting Slicks
Joined: Feb 2001
Posts: 2,608
Likes: 3
From: TEXAS - you mean there are other states?
I now know the difference between SI and CS 
SI to CS Alternator Conversion
I will consider this for myself as I need (read: want
) more juice. So, if the ampeage is 'on demand', there is no reason why NOT to do this 
How does this translate to voltage issues?
SI to CS Alternator ConversionI will consider this for myself as I need (read: want
) more juice. So, if the ampeage is 'on demand', there is no reason why NOT to do this How does this translate to voltage issues?
Last edited by kaiserbud; Mar 24, 2007 at 02:21 PM.
Thread Starter
Drifting
Joined: May 2004
Posts: 1,258
Likes: 0
From: Huntsville Alabama
No. The whole thing about the GEN light is that the bulb provides resistance for that brown or white wire that goes to the alt to tell it to charge. That's the one wire, and that's the important part to remember. Without resistance in that line the alt will never charge properly. Your kit may have included this somehow.
What you can do, is wire everything the way you have it. Take your one wire, spliced into a CS alt plug, and start the motor. Test the amt to see if it's generating 14V or if the engine is running off of the battery.
If it's not generating, add a resistor.
What you can do, is wire everything the way you have it. Take your one wire, spliced into a CS alt plug, and start the motor. Test the amt to see if it's generating 14V or if the engine is running off of the battery.
If it's not generating, add a resistor.
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
I do not know what type resistor, but it'll be equal to what that GEN light bulb would produce.
It would need to be inline anywhere in front of the alt. Go ahead and try it without the resistor. If it charges fine then you don't have to worry about it. If it doesn't charge then install it.
Melting Slicks
Joined: Feb 2001
Posts: 2,608
Likes: 3
From: TEXAS - you mean there are other states?
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Drifting
Joined: Jan 2004
Posts: 1,991
Likes: 3
From: Piscataway NJ
A 3 watt 75 ohm metal oxide construction resistor needs to be spliced into the wire going to the L terminal. If you are running a MSD or similar ignition system you also need to install a diode that will prevent run on when you turn the ignition off.
Thread Starter
Drifting
Joined: May 2004
Posts: 1,258
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From: Huntsville Alabama
What would happen if i did not run a resistor. My original 63 amp alt. worked with out the gen light being in the car. Then I upgraded to the Summit one that went out last night. So becareful about the summit brand alts. It did not even last six months and they only give a 90 day warranty. I just installed one i bought for a 90 vette per durango boys papaer. I have it wired like he says with the brown wire into a switched 12 volt source when the key is on. So will anything happen or just I just wait and get a resistor. I have ran the car and the volt meter was 14 volts and then when I turned on the electric fans and my head/driving lights it went to 13 so it looked fine. The case was very warm though. Thanks