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Old 10/02/2013, 01:57 PM   #1
franklinair
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The purple wire

I'm repairing/re-wiring the dash harness in my CS. (Arlie warned me!)
I cannot identify the purpose/function of the purple wire coming out of the ignition switch connector.
There are a total of 6 wires @ the connector:
Yellow (21) to factory splice, then to (37) alternator & (25) to HL switch
Pink (16A) resistance wire for coil
Green/red (904) to Voltage regulator
Red/blu (32) to Neutral switch
Black/grn (297) from fuse panel
Purple ????

Any ideas?

Neil
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Old 10/02/2013, 02:20 PM   #2
CougarCJ
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Mine is next to me in a drawer, no purple wire on my ignition plug.

Scott Behncke
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West Coast Classic Cougar A good source for Mustang mechanical parts too.
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Old 10/02/2013, 03:46 PM   #3
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On my car the original harness has this purple wire. The used original harness I purchased also has the purple wire.

Neil
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Old 10/02/2013, 04:40 PM   #4
CougarCJ
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Looked in our 1968 Ford Electrical manual under Mustang.

21 Yellow
297 Black - Green
16A Pink
904 Green - Red
32 Red - Blue
37B Black - Yellow

Scott Behncke
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Old 10/02/2013, 07:39 PM   #5
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Ford docs are notorious for errors... many of the wiring diagrams have wrong colors/references. Some have numbers on wires that don't even show up in the legend on the drawing!

On the road and have a color coded wiring plan I did off my 68's. Will check to see what that purple wire is, if it showed up. Tach and fogs, GT/non-GT did make a difference on some of the wiring, don't think the connector area was one but will look....

Last edited by dalorzo_f; 10/02/2013 at 08:35 PM..
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Old 10/02/2013, 08:39 PM   #6
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Seems strange; 2 separate cars having the same anomaly with the purple wire. I have a printout of all wires (color code & wire number, plus circuit function) for 1965 thru 1973 models. This purple wire doesn't show up anywhere, and certainly not in the wiring diagrams.
Last resort would be to split the wrapped wiring bundle and physically trace the wire.

Neil
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Old 10/02/2013, 10:04 PM   #7
CougarCJ
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Why can't it be traced on the electrical diagram? Which position in the plug is this purple wire of yours?

Scott Behncke
1968 GT/CS 302-4V Honors flysis income beezis onches nobis inob keesis
West Coast Classic Cougar A good source for Mustang mechanical parts too.
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Old 10/03/2013, 05:02 AM   #8
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Here's a thread from another site.
http://forums.vintage-mustang.com/co...itch-wire.html
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Old 10/03/2013, 09:33 AM   #9
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Here's a photo of the ignition switch connector showing the purple wire. This is an original, undisturbed harness.
The connector in the car is identical. Wiring diagrams do not show this wire or function.

Neil
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Old 10/03/2013, 09:47 AM   #10
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Is there any power to it?
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Old 10/03/2013, 11:05 AM   #11
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No power applied, battery disconnected- until I complete 'cold' checks for all wiring/circuits. (A practice left over from aircraft experience.)

Neil
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Old 10/03/2013, 11:10 AM   #12
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From what I can find, the purple wire is the "Prove Out", which is active when the ignition switch is in the "Start" position. It provides a ground for the brake warning indicator in the dash, to illuminate the bulb and show it's functioning.

Steve

The wannabe formerly known as an owner.
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Old 10/03/2013, 07:01 PM   #13
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I KNEW someone here would figure this out. (Most likely....Steve)
Which also brings to mind: Scott said his harness does not have this mystery wire. How come?
I'm going to an 'airline cronie' reunion this weekend. When I'm back Monday I'll check & verify the circuit to the brake warning light. Thanks Steve.

Neil
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Old 10/03/2013, 07:10 PM   #14
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The main wiring diagram calls it out as "Violet" and it runs thru a red connector to the "Chassis Differential Switch".
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Old 10/03/2013, 07:38 PM   #15
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Looked at the fried harnesses out of the '68 S GT coupe and the violet wire goes to the red connector thru the firewall to the engine harness. Jumps to a violet/white past the connector and dissappears into the harness, a quick look did not show where it went and did not chase continuity...
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