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Under dash wiring question?

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Old 11-10-2014, 06:04 PM   #1
freddy4099
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Default Under dash wiring question?

I was replacing bulbs under the dash and came across 2 wiring connectors that are not connected, anyone have any ideas? The purple and yellow connector is on the left side of the steering column the book it says this connection should go to the neutral safety switch but my neutral safety switch works correctly. And the second connector with the 2 light green and and 1 blue wire I have no idea where this goes. This is a 1979 with automatic transmission.


left side under steering column





right side of steering column above throttle.

Last edited by freddy4099; 11-10-2014 at 09:49 PM. Reason: adding pics
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Old 11-10-2014, 09:22 PM   #2
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grn and blue might be the headlight dimmer switch, but you didn't say what yr your have and whether auto/manual
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Old 11-10-2014, 09:54 PM   #3
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on a side note, I thought maybe they went together so i tried plugging them together and they fit, problem is it turned my starter on full time and did not sound good at all, other than pretty much everything works in the car as it should except the door chime/key chime. so I'm at a loss for what these could be, I have no rear defrost as the car didn't come with it so I'm wondering if one wire connector is for that even though the car wasn't optioned for it. the headlight dimmer works correctly without this being plugged in.

Last edited by freddy4099; 11-10-2014 at 09:55 PM. Reason: more info
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Old 11-12-2014, 07:24 PM   #4
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not sure if anyone has any idea on where these connections might go, anyone else?
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Old 04-07-2015, 04:31 PM   #5
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Quote:
Originally Posted by freddy4099 View Post
not sure if anyone has any idea on where these connections might go, anyone else?
Ive been trying to identify plugs and wires under my dash too
no one seems to know guess will have to keep studying wire diagrams
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Old 04-07-2015, 04:42 PM   #6
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purple and yellow wire connector is for the NSS when the car is equipped with a standard trans. GM put both plugs for stand./and auto in the same harness. just tape it up out of the way, my 79 has the same unused plug. i think the other connector with the 2 green wires and blue, is for the backup light switch when using a manual trans. just tape it up out of the way...... the auto trans. used one plug, the manual used 2 plugs.....
https://docs.google.com/viewer?a=v&p...TYyNWViMWY1NzY

Last edited by speedreed8; 04-07-2015 at 04:51 PM.
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Old 04-07-2015, 06:31 PM   #7
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Quote:
Originally Posted by speedreed8 View Post
purple and yellow wire connector is for the NSS when the car is equipped with a standard trans. GM put both plugs for stand./and auto in the same harness. just tape it up out of the way, my 79 has the same unused plug. i think the other connector with the 2 green wires and blue, is for the backup light switch when using a manual trans. just tape it up out of the way...... the auto trans. used one plug, the manual used 2 plugs.....
https://docs.google.com/viewer?a=v&p...TYyNWViMWY1NzY
the PURPLE and YELLOW wire is for a the 'clutch safety switch'...if the car came with a manual transmission.

PROFESSIONAL ADVICE:

COME ON PEOPLE!!!!! One good way to set you car on fire...or melt down wiring is connect wire connectors together that do not belong together. LOGIC would tell you...if everything is working and fine....why join something together without knowing why they are there. Not each and every connector has to go to something. There are many...much like what is going on here....were put into the harness so GM did not have 2 specific harnesses for different options. They made one harness that accomplished both tasks. Like some say: "If it ain't broke....don't fix it".

DUB
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Old 04-07-2015, 06:32 PM   #8
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Quote:
Originally Posted by corvettesummer79 View Post
Ive been trying to identify plugs and wires under my dash too
no one seems to know guess will have to keep studying wire diagrams
Need to see a photo(s) of the wire connectors in question.

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Old 04-08-2015, 08:50 AM   #9
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Quote:
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Need to see a photo(s) of the wire connectors in question.

DUB
what is the female plug with a red black and white wire under dash?
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Old 04-08-2015, 09:13 AM   #10
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Quote:
Originally Posted by corvettesummer79 View Post
what is the female plug with a red black and white wire under dash?
either the cruise control disengage or maybe the seat belt warning buzzer. are you sure about the colors really need a pic.

C141 on the cruise control at brake switch is red black white.

http://www.corvetteforum.net/c3/tune.../index21.shtml

Last edited by speedreed8; 04-08-2015 at 09:16 AM.
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Old 04-08-2015, 09:19 AM   #11
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Quote:
Originally Posted by speedreed8 View Post
either the cruise control disengage or maybe the seat belt warning buzzer. are you sure about the colors. maybe its pink / black tracer. really need a pic.
yes sure its a female plug with red black and white wire.
oh well thanks for the assistance
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Old 04-08-2015, 09:25 AM   #12
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Quote:
Originally Posted by corvettesummer79 View Post
yes sure its a female plug with red black and white wire.
oh well thanks for the assistance
that's what it must be its a difficult area to work in
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Old 04-08-2015, 11:46 AM   #13
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BUBBA 'knows' that you cannot have any loose wire ends anywhere in a vehicle. He would connect them to anything available...
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