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Happy New Years! I was looking at an old post that Wayne was involved in, I wonder if I could ask a question for anyone to answer?
I just picked up a non running '93 Cat 550 EFI. I bought it as it started smoking from the battery area and he disconnected it and left it to sit. Now it's in my garage with high hopes.... I used Wayne's diagram that he had circled the "Diode" located next to the EFI Relay and I feel that I have the same problem as I would suspect they did.
My brown fuse link was smoked, after giving it power and sorting out the broken ignition switch, I supplied battery voltage.... It seems that the throttle is also wonky as it does not indicate to the EFI relay to idle... As soon as I figured that out, I had a smoky short to ground, it appears that the Diode has shorted internally.
My question --- Is this an uncommon occurrence or is this the result of another gremlin?
Is there parts still available and if so, what would the part number be?
Is there a possibility that the ECM is also smoked? (Insert scared / sad face now)
Any insight you can lend will be appreciated.
Thanks again in advance, Nick
 

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I have a hard copy service manual for a 1993 Pantera 550 EFI / EXT 550 EFI. Let me know if you need info from it. It has wiring diagrams too. I can copy some pages and post them.
 
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