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Topic: 1973 C3 Temperature gauge sending unit

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1973 C3 Temperature gauge sending unit (1/10)
9/4/21 2:45pm

WayneG67
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Murrieta, CA - USA

Vette(s):
1973 Blue Coupe 2017 Z51

Joined: 8/17/2021
Posts: 11

Hi,I hope everyone is enjoying their Holiday weekend.I had a question about which dark green wire should be used for my temp gauge.There is a wire that comes right out of the firewall(passenger side)and there is also a wire in a harness on the driverside(both dark green) they both seem to go to a sending unit,i'm not sure.I'm swapping engines and not sure which is which??Thanks for any help!

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Re: 1973 C3 Temperature gauge sending unit (2/10)
9/4/21 3:42pm

F4Gary

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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 1409

On my 72, the green wire on the driver's side goes to the temp sensor. There is a green wire that comes out of a bunch of wires on the pax side and it goes to the A/C compressor clutch switch.

There was a temp sensor on the pax side of the engine (gone now) that was for the transmission controlled spark.

Adams Apple will be along soon with the wiring diagram...

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Re: 1973 C3 Temperature gauge sending unit (3/10)
9/4/21 4:58pm

manchestershark

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Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Joined: 10/31/2007
Posts: 2387

Greetings, Depending on the type you have, it could be for oil pressure sender if both go to drivers side.

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Re: 1973 C3 Temperature gauge sending unit (4/10)
9/4/21 6:59pm

73shark
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Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 866

I would try running a continuity test from the sensor to each one of the green wires and see which one is the one.

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1973 L-82 4 spd

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Re: 1973 C3 Temperature gauge sending unit (5/10)
9/4/21 7:52pm

WayneG67
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Murrieta, CA - USA

Vette(s):
1973 Blue Coupe 2017 Z51

Joined: 8/17/2021
Posts: 11

Thanks,That makes sense.I guess you use a 9 volt battery?

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Re: 1973 C3 Temperature gauge sending unit (6/10)
9/4/21 8:02pm

WayneG67
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Murrieta, CA - USA

Vette(s):
1973 Blue Coupe 2017 Z51

Joined: 8/17/2021
Posts: 11

Thanks,Oil press gauge is mechanical.This thing has been apart for over a month but i'm pretty sure the passenger side sending unit is for the temp gauge and the driver side is maybe for a smog sensor?Looks like(the wire) hadn't been hooked up in awhile?Seems like there's been some yokels that have worked on this car in the past!

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Re: 1973 C3 Temperature gauge sending unit (7/10)
9/4/21 10:38pm

WayneG67 said:

Thanks,That makes sense.I guess you use a 9 volt battery?

I guess you could do that but I was thinking of a extra long lead and using a VOM. The temperature sending unit on my '73 is located on the driver's side head.

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1973 L-82 4 spd

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Re: 1973 C3 Temperature gauge sending unit (8/10)
9/4/21 11:30pm

WayneG67
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Murrieta, CA - USA

Vette(s):
1973 Blue Coupe 2017 Z51

Joined: 8/17/2021
Posts: 11

Do you or did you have a sending unit on the passenger side?

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Re: 1973 C3 Temperature gauge sending unit (9/10)
9/4/21 11:51pm

F4Gary

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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 1409

WayneG67 said:

Do you or did you have a sending unit on the passenger side?

I did, it was for the TCS which has been removed and unnecessary.

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Re: 1973 C3 Temperature gauge sending unit (10/10)
9/5/21 10:39am

Adams' Apple

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Duncanville, TX - USA

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

Joined: 11/8/2003
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Temp sensor(single green wire) on driver side is for the temp gauge. Sensor (2 wire) on pass side is for the TCS(transmission controlled spark).

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Joel Adams
C3VR Lifetime Member #56
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