A few months ago there was talk of using a JC Whitney Keyless entry on a 5k. I have purchased a similar unit and am having some trouble getting it to work. It appears that the signal wire switches between 12 volts and ground as the locks are locked and unlocked. Is a relay needed to make the keyless entry work? Any info would be greatly appreciated. My car is an 88 5kcstq. John Uribe