there wasn't one from the factory, if all the bed mount hardware is clean and tight there will be a ground thru that, but if you're having problems with the lights, what most folks do is just add a wire from the rear cross sill [which is welded to the bedsides] to the frame .... you might also want to clean the factory attachments from the battery to cab and engine to cab

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics