Topic: Under Dash Wire Identification

[1970 Snake]

Can anyone advise what this under dash wire is for (circled in pic), what it connects to and where the clip attaches to the dash? It was not connected to anything when I disassembled my car.

[jwc66k]

Did you look in the 1970 Mustang Electrical Assembly Manual? Your picture shows a blue wire with a red tracer that goes to a two pin rubber connector with the blue-red wire "protected" by a portion of the connector; and a black wire "exposed" in the connector. The "protected" wires in connectors used by Ford are usually hot, 12VDC; the black "exposed" wires are usually grounds. Ford usually keeps the same color codes for all years (my 1999 E250 has many of the same color coded wires). The wiring diagrams in the Assembly Manual shows a blue-red wire used in the light dimmer circuit and identified as "wire 19 (A, B, C, etc)". I found one that fits the blue-red and black in a common connector. It's for the ash tray illumination circuit.
There may be more.
Jim

[J_Speegle]

To start the detective process you have a plug with a ground and a wire connected to the dash lights it appears to me. Without getting out a wire diagram do you have the radio light already attached to the radio. First first guess given the wires and location

[1970 Snake]

Thanks for the info guys, this picture is from my disassembly file and considering your responses, it now makes sense that this is probably the AT shifter light connection and the clip goes on the front of the console. I will do some reviewing of the manual as suggested to see what this actually is for, there are a number of diagrams so need to ensure I review the correct one. Thanks again.

[1970 Snake]

my mistake, you are correct the wire is for the ash tray light and my console even has a faint marking on the underside where the clip was attached. My shifter light is attached by the wire running under the tranny hump floor pan to the outside of the fire wall and connects to the main harness there. Thanks again.

[1970 Snake]

I am looking for an under dash 12V power wire, can anyone advise what the square plug green wire is for, which I have circled in the attached picture, thanks

[Coralsnake]

AC I believe

[cobrajet_carl]

I am looking for an under dash 12V power wire, can anyone advise what the square plug green wire is for, which I have circled in the attached picture, thanks

Think it's for the evaporator de-icing sensor.

[midlife]

AC I believe

No believing; it is for the AC system: either the AC switch or de-icer.

[1970 Snake]

Thanks guys, my dash is still out of the car and what I was hoping for, is if someone could tell me if it does provide a 12V source which I can use for another accessory, as my car will not have an AC system.

[DougDyar]

You might look at the fuse panel. Some cars have an auxiliary power connection there consisting of a brass strip type fuse holder thingy. I don't know the correct term, but a pic of your fuse block would help to know if your car has this...
Doug

[midlife]

Thanks guys, my dash is still out of the car and what I was hoping for, is if someone could tell me if it does provide a 12V source which I can use for another accessory, as my car will not have an AC system.

No it does not.

[jwc66k]

Did you look in the 1970 Mustang Electrical Assembly Manual?

There are several options for power that really depend on your use. Do you want a "constant on" circuit? Do you want a power circuit controlled by the ignition switch? I have a basic rule I follow - don't cut any wires.
Jim

[1970 Snake]

I need a power source for my roll control switch and would assume this wire would supply that. There are two wires like this in that area the is another identical wire there with the same plug but it comes off the heater switch plug and assume it goes through the heater switch first, so is not a source unless the heater/AC is turned on. BTW I agree I do not like cutting wires, which is why this wire interest me as a fused source always on in the right location.

[krelboyne]

No believing; it is for the AC system: either the AC switch or de-icer.

I think that it plugs into the fan switch resistor. Also, should be one more wire with plug like that.