Let me start off by saying I know nothing about trains. I am helping my father in law install railroad flashers. We purchased Evemodel JTD877RP railroad flasher kits and wired them as instructed but they flash erratically. To make things stranger, if I place my hand across the circuit it flashes as it should. Basically I am adding my body resistance to the circuit in order to make them work properly. There is a resistor already attached to the flasher but I am wondering if I need to somehow add a lot more resistance. Please advise.