[Dennis 460 ford]

mmmm,thats weird... I've connected almost all the wires like in the diagram. Only thing thats different at my unit. When i put 12 volts on the red wire en connect the white wire with ground the engine runs. When i disconnect the white wire with cold engine then it doesn't run. When the engine is at temprature it doesn't matter if its connected or not. What the function of the resistor of 1.3 ohms in this diagram?

thanks for your help so far!