928 Indicator Lights & Hazard Switch Wire Melted

[desperateaudio]

Hey guys I am new to the forum. I have owed several porsche's in my life but at the present time I owe a 1986 928s and I am hoping you guys can help me with the following issue I am having.

When I purchased the car she had been sitting for a while with only 3 owners (me being the 3rd) and 54K in milesshe is in very good condition but has many of the gremilns that come up on the 928's that have been left sitting. I have fixed all of them but one and the issue is as follows:

I pulled the CE panel out to do a cleaning as normal and here is what I found: (For reference I also have the POD completely removed from the car so I have direct access to all switch bases)

1. I took notice that the "B" plug has a wire at pin "15" that got so hot from the back of the plug heading into the wiring harness that it melted the rubber covering right off that wire all the way to the harness up under the dash.

2. Also I noticed that on the back of the CE Panel where the "B" Plug would attach into the CE Panel there is a jumper wire from pin "15" to Pin "14" of the "B" Plug that is also had it's rubber partially melted off it.

3. The wire is black and is a power supply when the ignition key is in position 2 and start. The wire originally starts it's life at the ignition switch Terminal 15, goes to the CE Panel - "B" Plug at Pin "12" and jumps from there to Pin's "13", "14" & "15".

4. From Pin "15" it exits the back of the plug, goes up into the harness under the dash and according to the schematic I have it comes straight to Terminal 15 of the Hazard Switch.

See this link which is Page 4 and you go to grid G5:

http://www.manualslib.com/manual/392...?page=4#manual


5. I have checked the continuity of the wire between the ignition switch and the "B" Plug Pin "12" and all is good. I have checked the continuity of the jumper wires from the "B" Plug Pin "12" all the way to Pin "15" of the "B" Plug and all is good with the wire.

6. I checked the continuity of the wire in question from the "B" Plug Pin "15" to the bare copper where it disappears into the harness under the dash and I have continuity but when I check it from Pin "15" back to the Hazard Switch Base at Terminal 15 I have no continuity which seems to me that the wire in question must have burned through and severed itself up insde the harness. Would this seem correct to you folks based on the attached schematic?

7. There are NO burned or melted wires at the Hazard Switch Base.



FOR REFERENCE: These are the rest of the items pulling power on that line from Terminal 15 of the ignition switch to the "B" Plug Pin "12"

"B" Plug Pin # 12 feeds power to Pins "13", "14" & "15" but it also feeds the 7.5A fuse for the AC which then travels back out of the CE PANEL via "G" Plug.

"B" Plug Pin # 13 goes to the back window heater switch.

"B" Plug Pin # 14 goes to the kick down switch.


This whole issues is centered around the Hazard and Individual blinkers for all 4 corners of the car. Now here is the problem. The Hazards work but the individual blinkers do not. If you look at the schematic page noted above you will see that when you push the Hazard Switch in to make the hazards works you get power from Terminal 30 which is direct battery power. When the switch is open which is the default you get turn signal power from Terminal 15 via the "B" Plug Pin "15".

I believe the fix is to replace the burned wire from the "B" Plug at the CE Panel to the back of the hazard switch and then my blinkers should work.

What do you folks think?

Also what the heck could have caused this to happen? Nothing else is at all messed up in the car. The car has not been hacked in any way it is all original. No water from what I can tell. I find it very odd so any help you guys can offer would be greatly appreciated.

Thx in advance for all your help,

A