91 TR - Door wiring harness

I believe the TR door connectors are under the front windshield scuttle area -- see post #2 here for the C1 LH door connector location:
http://www.ferrarichat.com/forum/boxers-tr-m/478520-fuse-panel-ashtray-amber-marker.html

 

Don't have the schematic with me. If the small round red light only has a single wire, then it must ground by contact between its metal housing and the door frame -- have you tried inspecting/cleaning that connection, or does the small red light have two wires going to it?

 

Is the white light on the bottom face of the door also not working?

 

If a ground issue you can isolate a bit by the multiple paths the black wire takes: from your inoperative red door light there are two black wires on one terminal: one goes to the white (bottom door) lamp, the other goes out the door to the C1 connector. From C1 it again branches into two paths: one wire goes to your door pin switch (on your car there are two switches in the jamb--the bottom one controls your lights and the top one controls the auto seat belts) and then on to provide a ground for the ignition key lamp. The other goes through the C8 connector (on far RH side of dashboard) up to the interior lamps on the roof console. Also at C8 a single wire goes similarly to the RH door and those door lamps. So that whole circuit becomes "grounded" when (one of) the doors are opened and the pin switch grounds to the door jamb.

So check what is/is not working which will narrow down a faulty ground path. If all the above isn't working then I would look at the door pin switch. If the white door lamp works I would more suspect a power problem (vs. ground). If you need me to outline the power path let me know.

And yes, your door originally had two black vinyl vapor barriers. I can post details on those if you'd like.

 

Yeah -- that might be a small technical problem

I'd try taking some pretty desperate action to repair insitu knowing the dash project hassle. I can't recall if there is any easy access to the C1 area from the interior (and my fuzzy recollection is there isn't)-- maybe some prior posted pics of dash projects might show something, but I don't have anything specific.

 

There is no easy access to C1. If the cuts are on the door side of the harness then it will be really difficult--you may need to remove the fender to access (see photo, fender is removed). If on the other side of the connector you will have more room as from the connector the harness is routed by the pedal box to the center of the bulkhead (behind the fuse box)--it looks like you could possibly pull it from behind the pedal box and then have 1-2 feet of harness free.
Image Unavailable, Please Login

 

thank you for posting the photos.
so without removing the fender it should be nearly impossible to get the complete wires out?

 

That's what I would try--You'll probably have to disconnect most/all the connections inside the door (I can't recall how much "slack" is in the harness wires) but with that done you should be able to push the harness into the jamb/fender area and create some slack--good luck!

With the RN (red/black trace) wire cut you should also have no power to the door actuator--I assume it also isn't working? (when you insert the key and turn to open/close the drivers door does the passenger side actuator open/close?)

 

Wooow ! Excellent photo Tim !