I have a 1994 GMC Sierra 1 Ton Dually with a 6.5L Turbo Diesel. Whenever I open the door and close the door, a relay under the dash on the driver side starts clicking (It sounds similar to the turn signal). The clicking lasts for about 20 to 30 seconds then turns off and wont turn on again until I open a door. Also, when I close the door, the overhead reading light and the floor lights blink in sync with the clicking relay. This happens when the truck is running and/or off. The problem doesn't affect the truck while its running or when I fire it up. It runs fine! Anybody have any Ideas on what the problem may be?
