Hondata

I know the A16 ALTC output is one of the aux outputs, but I was wondering if you can use it to control the output of the alt. I'm trying to setup up somthing that kills the output of the alt when I want it to..

The ECU does this under nromal driving conditions.

I know it will reduce the output but will it stop all output. I want to stop it during WOT.

No, it reduces the voltage to 12.5V during cruise.

Ok so from the factory at cruise is reduces the alt output. In my application (non street legal race car) I would like to setup an output from the s300/ecu to kill the output of the alt all together (basicly open the field wire).

If the S300 can control the ALTC output can I just use the output as wired from the factory? or sould I use another output and a relay?

I guess you could experment with disconnecting the field wire, and seeing if the alternator output drops, then use a relay switched by the ECU is disconnect it under full load.

That was my idea. I guess I'm confusing the field wire and the ALTC output. I was hoping I could just control it thought that wire without modifications.

Thanks for your help. This is my first experience with hondata and now I have a S300 and love it so far (including the support)

Is there any future plans to permit S300 control of the ALT-C voltages? I am using a LiFePo4 racing battery, and would like to be able to control the output of the alternator based on voltage. The batteries need a peak charge voltage of 14.4 volts, so I would like to be able to drop/turn off the output voltage of the alternator when that voltage is reached, and then turn the alt back on when a voltage drop to 13.2 volts is reached.

Do you know what the peak regulated voltage for the Honda OEM alternator is? Is this a moot point?