Porsche Repair: 1987 Porsche 944 Electrical Starting Problem, fuse box, intense problems

Question
Oh great one, I have a question since my 1987 manual transmission 944 will not start.  

First, the sensors were missing above the flywheel housing and they were not marked.  It appears someone did a good job of removing any reference to which one is which.  So, why did I buy this car?  Because, I love to solve intense problems so I learn great things in the process AND because the former owner needed the money for a house payment and I love the 1987 944 so much that I wanted two of them in my garage!  Okay, now that we have that out of the way, let's move on to the great puzzle.

So, I purchased two (2) new sensors and installed them, but car still wouldn't start.  I found I had no spark.  Then I checked the (sensors DME side)wiring and found one of the sensor plugs had been mangled.  This has been fixed with a new plug replacement.

Now, here is the BIG question:  Why is there no response from the fuel pump with a new DME relay installed in the fuse box?   

Now, I must say that I also found my computer (some call it the DME computer, DEE, or ECU) was bad, so a new one was purchased that I know works because I took it over to my 1987 944 Automatic transmission model and fired her up no problem.  Also, I discovered that this car had/has an alarm system since there was an alarm module connected near the DME computer (ECU under floor passsenger side), an alarm switch HIDDEN inside the fender well, and a switch inside the engine compartment that grounds when the hood is shut.

When I jump the circuits number 30 and 87b (these are electrical terminals that live in the fuse box and accept the DME relay connection), the fuel pump runs.   
So, how come nothing works when the DME relay is placed inside the fuse box?  What do 85b, 87, 85, and 86 have to do with this circuit completing?
Is there any other relays inside the fuse box which MUST be PRESENT at the same time for the DME relay to complete its circuit and send power to the fuel pump?


This is a real head scratcher, so any help is much appreciated.   

Thank you in advance for your help with this request.

ed

Answer
Hi Ed,

I'll give you the answer but you're still going to be scratching your head...as the wire you really need to have work is coming from the DME...and once inside it goes to the circuit board and I can't track it any longer.

Anyway, here's how the fuel pump relay works:

First, let's make sure we're talking about the same part.  The wiring diagram refers to it as the Digital Electric Motor Relay.  Think of this as a two part relay...or a relay that does the work of two relays.

Here are the connections I see:

30=red/green 12v+ directly from Battery positive terminal, hot always
85= signal from the DME via red/green to turn on the A/C compressor (meaning connect the A/C compressor to the battery power from the red/green wire)
85b=yellow/black or gray black; or yellow/black changing to gray/black, leading to the DME, signal to turn on the fuel pump
86= ground (the connection is coded E22.  Verify through a continuity test this is a ground, OK?
87= 12v power to the A/C compressor when the relay is activated
87b=12v power to the fuel pump, black/green wire, when the relay is activated

As for the other things that have to be present, the key one is power to the DME via the green wire from the coil.

Write back and let me know what you see and find, OK?

Dave