This is the fist hard wire decoder that I have put in. Every thing works but the light.I first hooked it up it would not work and you could hear a clicking noise like it was shorting so I changed the wires around and it came on once and that was it do I need a resistor on the front and back lights or am I doing something wrong. THe decoder is a loksound micro v3.5 If I need a resistor what size
