Originally Posted by bobs987
Can you give me a little more detail? You should be able to connect up Gnd to 0 volts, Vin to 12 volts and it should sit there and do nothing. You can then use a a penny to connect the vin connection to the ACC Lug, hold if for a second and the relay should click on and stay on. The LED should stay full on as long as you have Vin and Acc connected to 12 volts. As soon as you release the ACC line, the LED should flash and eventually the Relay should click off.
Please tell me your situation with this level of detail.