Ok, I've always thought of myself as fairly proficciant with vehicle electrical systems. I've installed stereos, fog lamps, fire dept strobes and power supplys, but, boy was I wrong.
I am having some problems with the ECM fuse constantly blowing so I thought it would be a good time to go buy a digital multimeter and test to see which wires on the fuel pump relay are overloading. Problem is, all those freakin ohm symbols and stuff are confusing. All I want to do is test the load on the wires and find the ones that are overloaded.
Where on earth can I find what the resistance is supposed to be and how do I go about testing a single wire? The book that cam with the multimeter says nothing about that.

 

I was hoping Vader would jump in here...

I've never had to chase down an ECM fuse problem. But, basically, it's returning too much current to ground. Not sure why you think the fuel pump relay is involved, but basically you need to check resistance to ground w/o power applied and compare that to the ohms specified by whatever you're seeing all those ohms symbols and stuff.

 

As soon as I plug in the F/P relay, the ECM fuse blows (fuse in engine bay). Same thing happends vice versa. If I plug in the F/P relay and then put a new ECM fuse in, it blows. So, I have to test one without the other. With the relay in, I get a reading of 12v on the red wire at the ECM fuse port. With the ECM fuse in, I get a reading of 12v on the orange wire at the F/P relay...none of the other wires show voltage.
Now, with the ignition to the "on" position, I get:
.5v on the red wire
.5v on the green/white wire
12v on the orange wire.

Should I be getting this much voltage to a relay?