I have a 240V 2 speed Magnetek 1081 motor/pump connected to an Intermatic RC2491RT mechanical timer on my swim spa, everything 20+ years old. I want to add a 240V ozonator powered on LO only. When I test Line2 terminal and the Timer/Lo terminal I get "0"V when the pump is OFF, 240V when the pump is LO, and 5V when the pump is HI. I expected the HI reading to be "0"V (Line1 is 240V on HI, OFF; "0"V on ON). Where is this 5V possibly coming from, and would it harm the ozonator if I connected it? All other voltage combinations seem normal.