Unit- i 3 series Photoelectric Smoke Detector 4 w-B: I have two units wire together according to your diagram. When I power up the units( apply 12VDC from my battery) I see my E.O.L. resistor (2000 ohms) on the output of the relay. The green LED flashes, but the red LED does not ??? The red LED Stays on after pressing the recessed test switch and my output of the E.O.L. resistor reads a short. What am I doing wrong???