I've got to change the glow plug relay on my 2002 7.3, and I've got a couple of questions. Do I need to disconnect the batteries first, and is there a certain order to hooking up the relay to avoid damage???? Thanks in advance.
Disconnected both battery - cables, changed out the relay, reconnected the battery cables and it fired right up. I don't have a test light to check the new relay but with upper 20's forecast again tonight the mornings start up will tell the tale!