Tim, I checked the grounds that route through the blocks mounted on the inner fenders. I think the parking lights housing is grounded to the grill. I also used a circuit tester (new) on the plug that connects to the aluminum flasher with the ignition on and attached the clip from the tester to the battery ground. (6 volts) and did not get a response.The flasher unit itself is new from Classic Parts and has always worked. Nothing has changed and the truck is kept inside. All the wiring is tight, soldered with heat shrunk tubing. By the information I've given you can probably guess I'm no electrical wizard but I can usually follow clear instructions.Thanks to everyone else who has offered suggestions. Steve
