ConcoursMustang Forums
1st Generation 1964 1/2 - 1973 - Questions & general discussions that apply to a specific year => 1970 Mustang => Topic started by: 1970 Snake on February 05, 2021, 01:53:27 PM
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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.
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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
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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
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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.
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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.
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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
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AC I believe
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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.
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AC I believe
No believing; it is for the AC system: either the AC switch or de-icer.
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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.
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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
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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.
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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
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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.
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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.
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I can definitely confirm it is NOT the wire that goes to the heater resistor. That is a totally different part of the wiring harness and is much longer and this wire would not even come close to the heater. There are also another two wires green and blue with the same plugs which run across the top of the lower dash (see pic 801) that also do not connect to the heater, so I believe all of these heavy green wires, the ones at the heater switch and over the globe box are for the AC system, which my car does not have. It looks like I am going to have to temp assemble my main under dash harness and steering column and bench test the entire harness system with a battery and the key switch to find what I need. Thanks.
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Then it goes to the micro switch on the controls.
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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.
I have no idea what a roll control switch is (unless it is a roll-over fuel cut-off switch, which certainly isn't concours...), but on a 1970, your best bet is a fused ACC line running off of an optional 3 prong female plug tied into the slanting slot on the fuse box, which I refer to as the fuse buss extender. The fuse is designed for 20 amps, and will always be hot when ACC or RUN (but not CRANK) position on the ignition. There is no open RUN-only line in the passenger compartment for a 70 available to tap into without splicing wires.
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I have no idea what a roll control switch is (unless it is a roll-over fuel cut-off switch, which certainly isn't concours...), but on a 1970, your best bet is a fused ACC line running off of an optional 3 prong female plug tied into the slanting slot on the fuse box, which I refer to as the fuse buss extender. The fuse is designed for 20 amps, and will always be hot when ACC or RUN (but not CRANK) position on the ignition. There is no open RUN-only line in the passenger compartment for a 70 available to tap into without splicing wires.
This buss is the brass thingy I was talking about in my previous post. This is your solution. Post a pic of your fuse block.
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Midlife, just to be clear, although I am building my car about 90% concours correct, I want to drive it once in a while and maybe a bit hard, so I am modifying it a bit like most guys did back in the day to their "brand new concours correct cars". To that end I am installing a roll control (front brake line lock), bigger tires on wide 15" magnum 500's, cross drilled and slotted front rotors, and headers with a custom SS mandrel bent 2.5" dual exhaust system which exits threw modified 1970 NOS Mach 1, chrome exhaust tips.
So I need/would like to locate a 12V power source for the line-lock switch which is located on the AT floor shifter and wanted to know if the green wire (which is handy and not being used) would have power to it when the key is on just like the AC system or heater, without having to splice wires. This was the reasoning for my original question because I did not know if the green wire had power once the car was started, just assumed it did, but wanted some clarification, instead of an assumption seeing the dash and steering column are not in the car yet, and I want to do any wiring mods before installing them.