Sorry I had a typo it was 13. Not 15. Charge volts are 14.5 then smooths out and stays at 13.5/6

Are you running the original CTS supplied by Holley?  The Holley supplied units will often under-report temperatures when hot.  Are you using Sniper timing control?  And, what alternator are you running?

And your ignition setup?  Contact me in a message and you can send your configuration file to me via email.  

I'm having trouble with the 64k limit on this site, so I parked a .pdf that is a typical 3G wire diagram on Google Drive. It is here: https://drive.google.com/drive/u/1/folders/10FqYlsGT1XXr8B5TCF9WAASkU4vdPtuJ, and titled 65-66 3G.pdf.
Now, my question is to TKO Performance. Above you asked: "Is it setup as one wire, or does it have actual voltage feedback from the tail end of the electrical system so it knows how much to charge?"
In the diagram (assuming it is correct), it must be measuring the voltage at either "A" or "I" or comparing the two? Could you elaborate a bit please? I'm really curious if this is correct and how it handles feedback. Thanks


 

Mach1Driver wrote:

I'm having trouble with the 64k limit on this site, so I parked a .pdf that is a typical 3G wire diagram on Google Drive. It is here: https://drive.google.com/drive/u/1/folders/10FqYlsGT1XXr8B5TCF9WAASkU4vdPtuJ, and titled 65-66 3G.pdf.
Now, my question is to TKO Performance. Above you asked: "Is it setup as one wire, or does it have actual voltage feedback from the tail end of the electrical system so it knows how much to charge?"
In the diagram (assuming it is correct), it must be measuring the voltage at either "A" or "I" or comparing the two? Could you elaborate a bit please? I'm really curious if this is correct and how it handles feedback. Thanks


 

It's the "A" terminal.  When they do these as a 1 wire they loop the "A" terminal to the charging post, basically reading only the alternator's output and using that as the reference for the voltage regulator.  This is probably fine for a vehicle that has a very, very basic electrical system.  1 wire alternators were originally designed for street rods.  When you add a bunch of electrical stuff to a classic like power windows, a decent stereo with amps, electric fan, etc.  it changes what the alternator needs to see to charge as best as possible.  In a simple system using the charging post directly is fine, because its likely so close to the voltage everywhere in the system as to make no difference.  The proper way to wire it in a more complex system is to read voltage downstream from the alternator.  Often this is done by running a wire from the "A' terminal to the "BATT" terminal on the starter solenoid, which is where a lot of accessories are often tied, so you are reading voltage where the load exists, instead of at the alternator's charging post where there is no load.  There are other more involved ways to do it, but mine runs to the solenoid. 

The "I" terminal is the exciting wire.  Its a keyed 12V, which runs through the ammeter/warning light in the factory system, but the source is the ignition switch.  I run an aftermarket voltmeter, so my "I" terminal is just wired to a keyed 12V source in the engine bay and my voltmeter reads off another keyed 12V source inside the car. 

I don't believe the voltage regulator compares the voltages from the "I" and " A" terminals. Pretty sure the "I" wire turns it on and the "A" wire tells it what to do output wise.  Then the regulator in essence turns the charging on and off as needed to maintain proper voltage.  That happens a bunch of times a second, so its unnoticable. 
 

TKOPerformance wrote:

Mach1Driver wrote:

I'm having trouble with the 64k limit on this site, so I parked a .pdf that is a typical 3G wire diagram on Google Drive. It is here: https://drive.google.com/drive/u/1/folders/10FqYlsGT1XXr8B5TCF9WAASkU4vdPtuJ, and titled 65-66 3G.pdf.
Now, my question is to TKO Performance. Above you asked: "Is it setup as one wire, or does it have actual voltage feedback from the tail end of the electrical system so it knows how much to charge?"
In the diagram (assuming it is correct), it must be measuring the voltage at either "A" or "I" or comparing the two? Could you elaborate a bit please? I'm really curious if this is correct and how it handles feedback. Thanks


 

It's the "A" terminal.  When they do these as a 1 wire they loop the "A" terminal to the charging post, basically reading only the alternator's output and using that as the reference for the voltage regulator.  This is probably fine for a vehicle that has a very, very basic electrical system.  1 wire alternators were originally designed for street rods.  When you add a bunch of electrical stuff to a classic like power windows, a decent stereo with amps, electric fan, etc.  it changes what the alternator needs to see to charge as best as possible.  In a simple system using the charging post directly is fine, because its likely so close to the voltage everywhere in the system as to make no difference.  The proper way to wire it in a more complex system is to read voltage downstream from the alternator.  Often this is done by running a wire from the "A' terminal to the "BATT" terminal on the starter solenoid, which is where a lot of accessories are often tied, so you are reading voltage where the load exists, instead of at the alternator's charging post where there is no load.  There are other more involved ways to do it, but mine runs to the solenoid. 

The "I" terminal is the exciting wire.  Its a keyed 12V, which runs through the ammeter/warning light in the factory system, but the source is the ignition switch.  I run an aftermarket voltmeter, so my "I" terminal is just wired to a keyed 12V source in the engine bay and my voltmeter reads off another keyed 12V source inside the car. 

I don't believe the voltage regulator compares the voltages from the "I" and " A" terminals. Pretty sure the "I" wire turns it on and the "A" wire tells it what to do output wise.  Then the regulator in essence turns the charging on and off as needed to maintain proper voltage.  That happens a bunch of times a second, so its unnoticable. 
 

Thanks, that's a clear and concise response.