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Thanks Jonny, I got your point. I noticed a user from rennlist had same battery like mine, 175A WOSP alternator, but without Electric AC. He mentioned he had the voltage up to 14.0V at idle, and yet it is about 13.4V for me. I understand the temperature might be a factor. Do you have any theory or testing figures when developing the alternator voltage versus ambient temperature to battery and alternator? I thought temperature might affect as little as 0.1-0.2V difference. Do you have any reference about the temperature versus voltage? Do you think it could be bad grounding in the car (from alternator ground to chassis)? will that possibly cause my concern? Thanks Parker

Since as per to my knowledge to battery charging voltage, or all the articles about the alternator voltage. I installed a battery voltage monitor at the battery posts, it gets to 13.4-5V max when the car is running with AC on. Seems voltage is lower than what I expected thus I think it is not charging the battery, but battery seems stay in full most of the time after the car is sitting for a while. I can see other case in rennlist with same battery and 175A alternator regular AC and his voltage kept at around 14.0V. So I would to understand what could be the issue of this difference? Is it normal I only have around 13.4-5V not above 14.0V when the car is started in the system? Thanks Parkrer

Hi, Had my 240A alternator for a while and recently running some Electric AC Voltage threshold setting and test. And I found the out put voltage is lower that what I expect. At idle without any loads, it was showing 13.7V (measured at the engine bay by tapping rear fuse box and body ground), and the battery terminal voltage is showing 13.5V. And when the electric AC is switch on, the voltage will dip to 13.2 at the battery terminal. When the car is running, the battery voltage is showing 13.4V with all RPM range. I am running a 60AH Antigravity Lithium Battery. Just confirm does WOSP alternator have different voltage regulator for lithium battery or I can add some diodes to increase the voltage? Thanks

Thanks Jonny, Managed to bypass the battery kill switch, doesn't help the situation. Also I connected the 12v to RED, ORAGNE and GREEN and ground to BLACK from the compressor connecter. It didn't start the compressor neither. Any advice? Thanks

Hi Jonny, I had a system installed on my 1991 964 few months back. I have a batter isolator installed at the negative side of the battery. It was running fine till car was on the jack and battery was disconnected for few days. Firstly the compressor was running intermittently for short period of time and not running at all. .Doesn't responding the CCU switch nor the PUTTY command line CMP=50 or CMP=100 I have deleted the contractor as per service bulletin. Also I did check the 3 separate voltage from ECU side connector. Trigger did responding to the CMP=50 or 100 and reading 6.15V or 12.8V. I have attached a picture of the status from PUTTY. I can see the compressor current is reading zero but the compressor speed is showing 090. Any idea what will my cause? Thanks Parker