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Hi everyone, I am trying to identify this brown wire; It is sitting in the console area of my 76 behind the AC/Heater switch. Here are pictures of both ends of the same wire highlighted in yellow. I appreciate any help. Thanks.
Last edited by hgoodwiniii; Aug 9, 2022 at 01:12 PM.
Thanks; No open connection from the switch that I can see. I have a brown wire connected from the left of the ac/heater switch that connects to the brown wire going to the fuse box shown here in the blue circle.
Last edited by hgoodwiniii; Aug 11, 2022 at 02:27 AM.
I will take a wild shot at it...
Studying the 76 A/C line diagram I only see 1 Circuit using a Brown wire in that area...
First check your Master Switch connector.
There should be a single Brown wire (Circuit 50) in one cell and 2 wires a Tan (Circuit 63) and a Lt.Green (Circuit 962) in the 2nd cell.
If in fact that wire in your first photo is Brown and not Tan...
It is possible that at some point there was a problem with Circuit 50 (Brown Wire) from the F/M connector to the Master Switch.
A new Brown wire was installed with new crimp terminals, new plastic housings and they simply removed the Tan and Lt.Green wires from old 2 wire housing and install in new 2 wire housing.
They just never completed the repair by removing that section of wiring.
I have a 74 GM service manual and it only has 1 brown wire that the A/C line diagram.
I do have a single Brown wire (Circuit 50 that connects to the brown fuse box wire) in one cell and 2 wires a Tan (Circuit 63- that connect to the rear end of the ac/heater switch) and a Lt.Green (Circuit 962) in the 2nd cell
Your findings here make me comfortable
I checked other areas of the 74 electrical diagram and I see a brown wire for the tach. My tach is working
On top of that, everything is working, Your wild shot maybe correct. I just hate to start pulling stuff apart for no reason. I will try to get a snake camera back there. I'm hoping someone that has their gauge/radio and or console out can check and chime in
In the meantime, I appreciate any other feedback anyone may have.
Last edited by hgoodwiniii; Aug 10, 2022 at 08:20 AM.
Here is a simple test, do a Ohms reading at both ends of the Brown wire in question...
Shake it around a little doing the test...
It may originally had a bad crimp at either terminal or a broken link between point A & B...
I checked around with my snake camera and could not see any other loose connections. I also checked Ohms on both ends of the brown wire in question and Ohms seem fine. Everything works so I'm thinking the unconnected brown wire may be long ago repair related like bmotojoe suggested. Who knows.
On another note- after years of searching, while troubleshooting this brown wire, I found out why my factory ac was not blowing much through the vents. It was due to a small vacuum line leak that leads to the air door flap that sits in the passenger side coil area. Hope that helps someone down the road.
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1976 Brown Dash Wire
