The SRT6 manual say's that the I/C pump is operated by a pulse voltage from a control module. I'm a licensed electrican and also have a degree in electronic's. I pulse voltage to me means that it would be like a square wave form, this inverted with a line across the top ( l_l l_l ), used mainly in speed control applications. Does anybody know what they are talking about? I have a hard time believing that the pump is variable speed. I'm wanting to tap into the pump curcuit to get it to run anytime I turn my aftercooler fans on.