Was told by mechanic who performed recall today that my glow plug relay was bad and causing the starting issues. I replaced the relay and its doing the same thing. Compared with a test light to a buddy's truck and I'm not getting a signal on the purple with red stripe wire that powers the relay to bring on the glow plugs. Checked all fuses and relays - good. Found that there is a fuse link which I believe to be at the connector under heavy black plastic. Tested the wire back behind it and still no power. HELP! Thanks in advance.