1999 Carrera 4 Diagnosing Electrical Short @ Fuse C2

[Jethro]

Good evening everyone. I've been chasing an intermittent short in the ignition/fuel injection (fuse C2) circuit. It's left me stranded a few times and I believe I've exhausted the most common issues. Would anyone be able to share wiring diagrams for the ignition, fuel injection, DME systems? 

 

Here are the things I've eliminated already: 

 

-Replaced ignition switch

-Replaced all relays in both relay panels  

-Unplugged all four O2 Sensors = C2 fuse still shorts

-Unplugged both Camshift solenoids = C2 fuse still shorts

-Unplugged DME/ECU = C2 fuse still shorts

-Unplugged Immobilizer under driver seat = C2 fuse still shorts

 

I thought this intermittent short was fixed six months ago when I replaced the engine but now the 30amp fuse either blows as soon as I put it in the panel without the ignition on or blows as soon as I turn the key on. I think I can figure this out with some good wiring diagrams. 

 

Thanks, 
Jethro    

 

[Loren]

I sent you a PM... but I am afraid it is time to trace wires back looking damage.

[jon3067]

I have a similar issue - no power at all to fuse A5  - so far replaced the entire rear loom - now stripping out the front one to replace - so many wires....