[Willie_B]

The relay is not getting power through it when it cuts off. There is power getting to it (orange wire) but not through it. I replaced the relay and still the problem persists.

BTW, I was testing the relay the last time it cut off and there was power going through it. Power remained going through it for a few seconds after the truck cut off. The relay clicked and the power was no longer coming through. During this time I also had power at the fuse.

 

[Willie_B]

Motor City Rick, thanks for the reply. Had obtained the wiring schematic but I think the bigger problem is understanding what is happening at various points in the circuit at a given time to be able to diagnose it. I certainly appreciate your help. To answer your questions;

Is there zero resistance on the black wire at the relay wiring connector, disconnected? Yes
Is there battery voltage at the orange on the relay? Yes
Within 5 to 7 seconds, do you get battery voltage at the grey wire of the relay when cranking the motor? No - except when it decides to crank and then it is there. When it cuts off, power remains until the relay "clicks" and then there is none.
When you apply battery voltage to the red wire on the relay or single pigtail, do you hear the fuel pump run back in the gas tank? No

Hopefully this will give you some insight into what's going on. In the mean time, I probably should mention that I replaced the fusible link, have checked all of the grounds that I can find (although I am not certain that I have found them all), and as a previously stated I have replaced the fuel pump relay and the oil pressure switch.

Thanks again.

 

[Willie_B]

Motor City Rick, I'm sorry I haven't got back to you in a few days. This morning I got the chance to conduct some of the tests you were presenting. The first thing I did this morning was look at my battery terminals and found that, although my positive terminal appeared affixed properly, when I put slight pressure on it it began to move. I pulled the terminal bolt out and found that it was slightly cross threaded at the end. I'm guessing that happened at Advance Auto Parts when the poor clerk was putting it in during a thunderstorm about a year ago. Anyway, I changed the bolt out and began to conduct the tests as you outlined. Upon doing so I found that the grey wire running from the in line fuse to the ECM was not seated properly in the ECM harness connector. I changed the motor out from the stock 305 to a 350 back last summer and in that process installed and pulled the ECM a couple of times trying to get the right chip in it. I'm guessing this probably had something to do with the wire not being seated in the connector correctly. In any event, I seated the wire back properly, she cranked right up and has been running ever since. Hopefully this solves any other issues. I'm not exactly sure which issue corrected what I was dealing with but it looks like it is fixed. If not, I'll hit you guys up again but your guidance certainly appears to have put me on the right track. Thanks again for your help and if you are ever in the West Central Georgia area I owe you a beverage of your choice.