T0RK

Update for anyone following. The fuse is no longer blowing. A previous owner/installer had tapped into the 86s wire on the original wiring harness, and bridged that connection with brown (ground) and ran the built in k40 laser jammer and lo jack theft deterrent system. I disconnected the bridge and isolated the wires until I can really get in and disconnect everything once and for all. The radio is working and fuse E1 is good. Now the car is not detecting the immobilizer (I unplugged it because I was sitting on the floorboard to diagnose all of this and didn’t want to crack it. Disconnected the negative terminal on the battery and waiting 30-45 minutes. Hopefully it fixes the final gremlin. Attaching pics of the hack job from one of the previous owners.

Here they ran out of clear speaker wire and decided to change to this white wire. Looks great…

See where they took the clear wire and tied it into the orange (86s) wire. Then routed the ground side to brown.

This is where the white wire, antennas for the lo jack and k40 laser jammer all met up to go up to the instrument cluster.

hardtailer

Great result! Your perseverance has paid off.
Congratulations

T0RK

thank you! Immobilizer unit is set and the car starts. Had to take the the jacket off of plug 1 of the immobilizer harness. Cleaned with deoxit d5, agitated with a makeup brush and blew it dry. Did the same for the DME. Now to get all of these wires cleaned up. I’m thrilled. Celebrating with a whiskey. Thanks to everyone for the help.

SoCal911t

Glad you got it figured out .
This is a classic example of why I try to avoid buying cars with aftermarket electronics installed. There have been far too many times that a ''professional" install was a complete hack job.

Porschetech3

All systematic procedural diagnostics go out the window what you have a rats nest of a mess in the wiring like that...lol

T0RK

That’s why I was confused when you led me back to your original procedure lol. Thanks for your help. Learned a lot, cursed a lot.

Gary12000

The aftermarket strikes again.. how these installation places were in business amazes me.. well done for sticking at it... you now know more about 996 wiring than most lol

K996

Great instruction and impressive perseverance! I hate dealing with electrical faults but then having to deal with a bunch of horrible aftermarket hack-jobs to the harness is a whole nother level of madness!
Well done

T0RK

I’ll hang on to the knowledge I gained throughout this process and try to help anyone that needs it. Looking back, I am glad I stuck with it and had the chance to learn so much about the car. I’m now battling a gearbox noise. The previous owner had a muffler bypass installed when I bought it, you couldn’t hear anything gearbox related due to the drone. After the fister mod/orange cap mod I definitely can hear the car. Problem is, not sure if it is normal or not. Posted a thread about it if you’re interested. Cheers!

Einsteiger

Angels and Ministers of Grace defend us.....from shade tree mechanics.

911Dreamer

Wow the parts you replaced that didnt need too....Good post so others may check