What are these wires? 1968 - Vintage Mustang Forums
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post #1 of 4 (permalink) Old 01-04-2019, 08:36 PM Thread Starter
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What are these wires? 1968

These wires are both hanging under the dash of my '68 mustang, 390 4 speed car w/tach. Non GT. I've attached two pictures of each plug. Any idea where they go? I did my best to identify the colors on them, they're rather faded!

Plug/wires #1: Red w/black tracer, brown or black(?), and yellow.

IMG_8494.JPG by armon7, on Flickr

IMG_8495.JPG by armon7, on Flickr

Plug/wires #2: Blue w/red tracer, white w/red tracer, yellow w/black tracer.

IMG_8496.JPG by armon7, on Flickr

IMG_8497.JPG by armon7, on Flickr

1969 Convertible field find (450hp spaghetti noodle)
1968 Fastback (428 and a 4 speed)


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post #2 of 4 (permalink) Old 01-04-2019, 09:02 PM
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Good chance they're for accessories your car isn't equipped with. When I took mine apart I took photos of every wire I disconnected as well as every terminal that wasn't connected to anything. Said photos came in very handy when I re-assembled the car. I browsed through the photos and didn't see anything resembling the ones you showed.
Remember where they are, put the car together, start it up. If everything works, good to go!

69 Convertible, 351W, T5, E-Brock Performer 351-W intake, Performer Plus cam, Holley 4160, power assist, dual exhaust, 4-wheel manual drums.
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post #3 of 4 (permalink) Old 01-04-2019, 10:02 PM
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I think your funky connector with the red/black wire is for the optional rear window defogger:

Your second connector may be the power and light feed for the original radio. Blue/Red is usually the dimmable dash lights and it looks like yellow/black is the original radio power if I'm reading things right.
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post #4 of 4 (permalink) Old 01-04-2019, 10:15 PM
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The 2 prong plug is for your radio. RED/BLU is illumination (dash light circuit) and YEL/BLK back to the fuse panel (power).

I think the 3 prong plug (triangular pattern) is for your heater/blower control. EDIT: I think Magnus nailed it.


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