I have a melting wire in the a4 c100. I tracked it to the ignition switch and I replaced the switch, but it is still melting at the starter fusible link. I heard it goes to the gear selector switch but am not sure. If so how do I get to it?

 

I also heard it goes to the lid fuse, and power accessories breaker but they look fine

 

A4 is the main power distribution wire for all the ignition power circuits in the car, and some of the constant power too. It goes to a lot of things

 

Is this for a 1986 Sport Coupe?
Which engine does the car have?

Below is an image of the Power-Distribution for a 1986 SC with the LG4 Engine (8th digit of the VIN =H):



Once passing into the cabin via the C100 Bulk-head Electrical-Connector, a 10AWG Red Wire is under the Dash that divides into 4 Red Wires at Splice S200.

The four Red Wires go to:
-The 15A Lid Fuse.
-The 35A Power Acc Circuit-Braker.
-And two Wires go to the Ignition-Switch.

I will post a different Schematic if you have a different Engine.

 

In the Engine Compartment; from Terminal position A4 in the C100 Bulk-Head Electrical-Connector, the 10AWG Red Wire goes to Splice S102 and then to Fusible-Link B at the Starter-Motor Solenoid Terminal.

Splice S102 also has other wires that go to different locations depending on the Engine in your vehicle.
If you would like I can Post the Information when you reply with which Engine you have.

 

it is a 2.8l mpfi and I looked for a splice a while back and the wire goes directly to the ignition switch but if it goes out of the ignition switch which wires does it branch off to?

 

Here is the Schematic for a 1986 Sport Coupe with V6 Engine (8th digit of the VIN: S):




Once the Two Red Wires Enter the Ignition Switch; Power comes out in multiple places (just as shown in the schematic above).

If your concern is in regard to the Crank/ Starter Solenoid circuit...
A Yellow 10AWG Wire comes out of the Ignition-Switch and goes to Splice S223.
From Splice S223, the Yellow Wire goes into the Automatic Transmission Gear-Selector Switch (shown on right side of diagram above).

Then a Purple 10AWG Wire comes out of the Automatic Transmission Gear-Selector Switch and goes to Splice S104.
From Splice S104, the Purple Wire goes out to the Engine compartment through the C100 Bulk-Head Electrical-Connector at Terminal B4.
From Terminal B4, the Purple Wire goes to the Starter-Motor Solenoid (all shown in the image below, in the right side);

 

Any luck with following the Schematics for the V6 Engine Power-Distribution?

 

On a side note, where could I buy that book you have with those beautiful color-coded schematics? You can pm me so as not to derail the thread. Thanks!

 

They are factory, Helm inc, Camaro service manuals

 

You can always call Helm Inc and see if they have any "New Old Stock" Shop-Manuals/ Electrical Diagnosis Manual-Supplement.
These Manuals were always expensive...
you should see some of the invoices that the Dealerships would receive each year when they would have to buy 300 different Manuals at a time.
GM Manuals of all kinds have become quite scarce now... it sucks!

I was able to purchase a "Mint-Condition" 1987 Camaro Shop-Manual in 2001 or 2002 that was "New Old Stock"...
I believe I paid around $400 at the time for the Two Book-Set.

Helm Brothers, now Helm Inc has produced most of the Technician Shop-Manuals for us (GM) for a very long time.
Their Web-Site is: HELMINC.com
Their Phone-Number is: 800-782-4356

If they do not have anymore of the Manual that you are looking for...
Photo-Copied "Black and White" Manuals do end up on EBAY and/ or Amazon, from time to time.
I have purchased many Shop-Manuals this way...
Unfortunately the copies and images are never great; but it's better than nothing.