Compression Ignition Addict
Join Date: Dec 2007
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The heads of the Torx screws are facing the firewall, you may not be able to "see" them.
Here's my thinking on the relay, if it's tripping then what's happening is that the NSSW has passed the signal to start and is causing the relay to throw (you could test this by putting the truck in D and see that you now Don't feel it trip)
So, what that means is your trouble is going to be from that point to the Starters Bendix. When you roll-the-Key to Start, it goes from the Ign sw, through the NSSW, and to the coil inside the relay. Once the relay throws it supplies power to the Bendix solenoid on the Starter itself. The Bendixs coil draws an Arm, with the starters Gear on it, into the Flexplate and large contacts get closed that power up the starters motor.
This isn't happening for you and I'd be thinking wiring, fuse ((#113 but, I'm not sure if it's before/after the relay, I'd think after but not sure...) or the Bendix or even the Starter itself. On the Bendix there's a small, (maybe yellow?) wire from that relay. If you can get under the truck, and have somebody turn the Key for you, you should see 12v go to that wire when trying to start.
If so, you have a starter problem (or connection or available power)
If not, something's wrong between the fusebox relay and the sm wire there...