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73 Electrical Question

Forum: C3 Electrical, Body and Interior

12 Messages
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73 Electrical Question

Posted: 8/4/06 10:19amMessage 1 of 12
T
Tinley73
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Homer Glen, IL - USA
Joined: 3/1/2004
Posts: 64
Vette(s): 1973 Corvette L48 Red with Dark Saddle Standard Interior PS PB A/C AM FM Stereo T/T NOM 350 LT-1 350 HP, Edelbrock Performer carb /manifold set-up, Hooker headers built June '73

I have a "loose" black 2 wire plug with one brown and one green wire just hanging in back of the compressor . it is about 15 inches long

Clues: it is NOT the one going to the ambient switch on the blower, the wire istaped together from the factory with the plastic connecting plugs on it, doesn't go th the thermal limiter by the a/c...

anyone got any ideas??? much thanks!

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73 Electrical Question

Posted: 8/4/06 2:07pmMessage 2 of 12
P
Pumps
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Virginia City, NV - USA
Joined: 1/19/2005
Posts: 314
Vette(s): 1979 Coupe, white in color

Sounds like the one that goes to my compressor clutch before I took the air apart.

Dave

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73 Electrical Question

Posted: 8/4/06 5:37pmMessage 3 of 12
r
ranger3
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North Charleston, SC - USA
Joined: 3/20/2004
Posts: 4208
Vette(s): 1975 L48 AT AC T-top
I agree. The wire going from the pressure switch to the compressor clutch are brown and green.
Scott
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73 Electrical Question

Posted: 8/4/06 8:12pmMessage 4 of 12
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22720
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
Sounds like it to me, too. The compressor connector is flat, with the two wires side-b-side; one brn, one grn.

Got pics?
There is a two wire,(grn/tan) connector that goes to the pressure switch for the A/C.Adams' Apple38933.8463773148

Joel Adams
C3VR Lifetime Member #56    
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

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73 Electrical Question

Posted: 8/7/06 6:18amMessage 5 of 12
T
Tinley73
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Homer Glen, IL - USA
Joined: 3/1/2004
Posts: 64
Vette(s): 1973 Corvette L48 Red with Dark Saddle Standard Interior PS PB A/C AM FM Stereo T/T NOM 350 LT-1 350 HP, Edelbrock Performer carb /manifold set-up, Hooker headers built June '73
The connector at the compressor clutch is green and black. One green going to the thermal limiter fuse and the black grounding to the compressor bracket. I think it is the one you speak of going to the pressure switch, wherever that is. I can take some pics...Do you have any Adam of your A/C?? Thanks
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73 Electrical Question

Posted: 8/7/06 10:25amMessage 6 of 12
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22720
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
No, but I can get one this eve....

Joel Adams
C3VR Lifetime Member #56    
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(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

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73 Electrical Question

Posted: 8/7/06 2:32pmMessage 7 of 12
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Redwingvette
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Waterford, MI - USA
Joined: 9/13/2002
Posts: 1795
Vette(s): 1973 Red coupe

On my 73:

The plug on the compressor: http://www.cardomain.com/member_pages/show_image.pl?image=ht tp://memimage.cardomain.net/member_images/1/web/565000-56599 9/565523_95_full.jpg

The plug for the thermal fuse which is attached to the tube by the air box: http://www.cardomain.com/member_pages/show_image.pl?image=ht tp://memimage.cardomain.net/member_images/1/web/565000-56599 9/565523_97_full.jpg

 

Brian - NCM Lifetime Member

73 coupe L48, Flat-top pistons, Performer RPM Heads, Crane Cam and roller rockers, Holley 650 vac sec. Performer intake,
3.55 gear BTO 200-4R trans,
Leather seats, Seatbelt Plus 3point seatbelts, Pioneer CD player
Magnaflow Exhuast System

Dewitt radiator and dual electric fans
Borgeson Steering box
 


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73 Electrical Question

Posted: 8/7/06 3:12pmMessage 8 of 12
T
Tinley73
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Homer Glen, IL - USA
Joined: 3/1/2004
Posts: 64
Vette(s): 1973 Corvette L48 Red with Dark Saddle Standard Interior PS PB A/C AM FM Stereo T/T NOM 350 LT-1 350 HP, Edelbrock Performer carb /manifold set-up, Hooker headers built June '73

Thanks Brian....mine is exactly like yours... The black and green go to the compressor. NOT the brown and green.  So, I am still in the dark on the brown and green plug...I will take a picture of the wires/plug asap... you should have it going somewhere. thanks for your help!

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73 Electrical Question

Posted: 8/7/06 6:48pmMessage 9 of 12
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Redwingvette
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Waterford, MI - USA
Joined: 9/13/2002
Posts: 1795
Vette(s): 1973 Red coupe

They use to go to the thermal swict that was mounted into the head. It didn't let the distributor advace until the motor was warm. It was an emissions thing. Mine has been disconected for ever.

http://www.cardomain.com/member_pages/show_image.pl?image=ht tp://memimage.cardomain.net/member_images/1/web/565000-56599 9/565523_98_full.jpg

Brian - NCM Lifetime Member

73 coupe L48, Flat-top pistons, Performer RPM Heads, Crane Cam and roller rockers, Holley 650 vac sec. Performer intake,
3.55 gear BTO 200-4R trans,
Leather seats, Seatbelt Plus 3point seatbelts, Pioneer CD player
Magnaflow Exhuast System

Dewitt radiator and dual electric fans
Borgeson Steering box
 


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73 Electrical Question

Posted: 8/7/06 7:17pmMessage 10 of 12
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22720
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
Dave, I think Brian is correct. There sholud be a sensor/sending unit in the pass. side head for the TCS(Transmission Controled Spark) system. It would only allow vac. to the dist in 3rd & 4th(in '73), and once the engine was warmed. The sensor in the head gave the temp info, and the switch on the trans gave the gear info. In '73, there was also a 20 sec. "delay" on the electrical signal.
I'll try to get a pic of my sensor plug/wires, as well as the press. switch for the A/C. Those wire have to be for one or the other.

Joel Adams
C3VR Lifetime Member #56    
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(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

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