2000 Tahoe Clicking

[sharonvrla]

Hi, just bought a 2000 Tahoe. With the engine off and no key in the ignition, there is a clicking sound in my pedal area up and to the left. IT stops clicking when I start the engine. I can see the box its coming from but have no idea what it is. Clicks about every second. Any ideas on what this is?? Its the black box mounted underneath with the yellow arrow pointed at it.

 

[Fless]

It's called a MBEC - Mid Bussed Electrical Center. Unscrew the plastic nut or just pull it off -- the nut threads aren't machined. Then you can pull the cover off to see the relays and connections.

Also known as a Body Wiring Harness Junction.