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1968 Corvair Warning light problem?
Posted by: me654hunting ()
Date: July 27, 2020 04:25AM

my 68 corvair monza 140 4 speed 3.55 positrack the temp light stays on when you turn the key on and will not go out with the motor running changed oil sending unit still the same.went through the wiring cant find anything wrong have any suggestions all the wiring ohmed out dont want to drive it with the light on dont want to burn up new rebuild help if you can mike



Edited 1 time(s). Last edit at 07/28/2020 08:28AM by MattNall.

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Re: 1968 corvair
Posted by: Spectre ()
Date: July 27, 2020 04:31AM

If the wiring checks out and the light is on with a stone cold engine, I would think the switch on the head is bad.

David Clamp


1965 Corsa convertible - 140 4spd/3.55/AM-FM

2013 Mustang GT convertible - 5.0, 6spd auto, Procharger i-1

2003 Miata SE - 6spd manual (wife's toy)

"Victory is mine!" - SG

Norman, OK

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Re: 1968 corvair
Posted by: Lane66m ()
Date: July 27, 2020 04:53AM

Disconnect wiring from the switch. There is a connector by the aft end of right head near bottom of area that can be disconnected. If light goes out, then wire from there to switch is shorted or switch has failed to high temp condition.

Al Lane
Ellabell, GA 31308

1966 Monza Coupe, 110 hp, 4 Spd
1966 Monza More Door 110 hp, PG
1968 Camaro SS Coupe 350 CI 295+ hp PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
1947 Farmall A tractor 15 hp


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Re: 1968 corvair
Posted by: me654hunting ()
Date: July 27, 2020 05:12AM

i disconnected the sending unit on head light still on

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Re: 1968 corvair
Posted by: Lane66m ()
Date: July 27, 2020 05:25AM

Get a new over temp switch. Make sure it is for a 140 head. Take old one out since it is no good and check its thread pitch to be sure.

Al Lane
Ellabell, GA 31308

1966 Monza Coupe, 110 hp, 4 Spd
1966 Monza More Door 110 hp, PG
1968 Camaro SS Coupe 350 CI 295+ hp PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
1947 Farmall A tractor 15 hp


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Re: 1968 corvair
Posted by: Wagon Master ()
Date: July 27, 2020 05:37AM

me654hunting Wrote:
-------------------------------------------------------
> i disconnected the sending unit on head light still on


Was this with it running? Was the oil pressure sender plugged back in?

'29 Ford Model A Tudor
'61 700 Lakewood 110 4 speed
'69 Monza Convert. 140 Auto.
'70 Dodge Challenger R/T 440 4 speed

Been aircooled since 1973
Northwest Ohio

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Re: 1968 corvair
Posted by: RexJohnson ()
Date: July 27, 2020 09:01AM

If you unplug the connector at the frame rail that goes to the oil pressure and the temp switch and the light stays on the problem is in the wiring of the car.

RJ tools
Salem,Oregon

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Re: 1968 corvair
Posted by: Frank DuVal ()
Date: July 27, 2020 09:08AM

Quote
hunting
i disconnected the sending unit on head light still on

SO the switch is not the issue. Check wiring by unplugging switch harness from engine harness like Rex says.

Easy to pinch the switch harness in the sheetmetal.

Frank DuVal

Fredericksburg, VA

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Re: 1968 corvair
Posted by: Murphy ()
Date: July 27, 2020 09:13AM

Frank DuVal Wrote:
-------------------------------------------------------
>
Quote
hunting
> i disconnected the sending unit on head light still on
>
>
> SO the switch is not the issue. Check wiring by unplugging switch harness from engine harness like Rex says.
>
> Easy to pinch the switch harness in the sheetmetal.

thumbs upthumbs up

65 Monza Coupe
61 500 Coupe-W100181
Earliest '61?

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Re: 1968 corvair
Posted by: Lane66m ()
Date: July 27, 2020 09:31AM

Sorry. Was in a hurry while with friends at breakfast. I am mistaken. Grounded wire. Pull connector that under the coil. Then see what you have.

Al Lane
Ellabell, GA 31308

1966 Monza Coupe, 110 hp, 4 Spd
1966 Monza More Door 110 hp, PG
1968 Camaro SS Coupe 350 CI 295+ hp PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
1947 Farmall A tractor 15 hp


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Re: 1968 corvair
Posted by: me654hunting ()
Date: July 27, 2020 10:34AM

it was running

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Re: 1968 corvair
Posted by: me654hunting ()
Date: July 27, 2020 10:41AM

i took out the ignition switch there is a pink with black stripe going to the key positive terminal part of the switch there is no power at the terminal with key in the on position this pink and black wire goes to the temp light in the dash would this be the problem ordered new ing. switch

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Re: 1968 corvair
Posted by: steve c goodman ()
Date: July 27, 2020 10:48AM

deleted post didn't read everything before typing sorry all

best wishes, Steve
Rear Engine Spec. Inc. Golden, Colo.

1962 spyder 3.0L turbo---1965 Crown V8
1967 monza 110/4---1968 monza 110/4
1971 amante gt 110/4
CORSA/RMC/PPCC/V8 Registry



Edited 1 time(s). Last edit at 07/27/2020 10:50AM by steve c goodman.

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Re: 1968 corvair
Posted by: Frank DuVal ()
Date: July 27, 2020 06:39PM

Why are you looking at the ignition switch? You know the lamps are getting power! They light up!grinning smiley

Frank DuVal

Fredericksburg, VA

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Re: 1968 corvair
Posted by: Lane66m ()
Date: July 28, 2020 03:18AM

You need to isolate where the wire is grounding out.

Here is the next point to check. If light is on with key on, (not started) with this connector is disconnected, then disconnect the engine connector and ohm check the wire in the engine harness to ground to see if it is shorted.

From there it will be an under dash connector being disconnected and the main body wire checked for a short.

You have to find the shorted wire.

Al Lane
Ellabell, GA 31308

1966 Monza Coupe, 110 hp, 4 Spd
1966 Monza More Door 110 hp, PG
1968 Camaro SS Coupe 350 CI 295+ hp PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
1947 Farmall A tractor 15 hp


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Re: 1968 corvair
Posted by: Lane66m ()
Date: July 28, 2020 04:02AM

Here is the whole circuit. You only to find the short on the blue wire.

Al Lane
Ellabell, GA 31308

1966 Monza Coupe, 110 hp, 4 Spd
1966 Monza More Door 110 hp, PG
1968 Camaro SS Coupe 350 CI 295+ hp PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
1947 Farmall A tractor 15 hp


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Re: 1968 corvair
Posted by: JimBrandberg ()
Date: July 28, 2020 06:03AM

Sorry if I'm redundant or simplistic but I'm not sure it was made clear.
The light in the dash has Positive whenever the key is on.
It gets Negative to make the light come on from either the oil pressure switch or the head temperature switch. If something is wrong it can get Negative from somewhere else like a wire worn through.
If you disconnected the temp wire and the light stays on I would do the same with the oil pressure wire. That ones easier to work with because the engine doesn't have to be running. If you disconnect the wire from both senders and the light is still on it's time to follow the wire along the chassis to see where it might be worn and grounding.

Jim Brandberg
Isanti, MN
CorvairRepair.com



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Re: 1968 corvair
Posted by: me654hunting ()
Date: July 28, 2020 01:28PM

got it fixed replaced blue wire from light in dash to sending units works fine thanks to all that helped thanks mike oh by the way this is a great forum thanks again

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Re: 1968 Corvair Warning light problem?
Posted by: MattNall ()
Date: July 28, 2020 01:37PM

Thanks for letting us know the outcome / solution!

MODERATOR
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..............................110-PG.................................................Webered-Turbo

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