1968 Chevelle Ignition Wiring - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

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post #1 of 8 (permalink) Old Jun 30th, 18, 11:46 AM Thread Starter
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1968 Chevelle Ignition Wiring

I'm working on a 1968 Chevelle and trying to sort out a few wires that the previous owner had cut on the pigtail harness going to the ignition switch. The black wire on the ignition switch which I believe should be ground was cut midway on the harness and I'm not exactly sure where that runs to? According to a wiring schematics I found online, it runs to somewhere by or to the driver side door jamb and warning switch?

Also, there is suppose to be a green wire that runs from the water temp switch to the ignition switch and then from there another green wire runs to the water temp lamp on the dash but those have been cut and removed from the pigtail connector. Where do the two green wires connect to on the ignition switch? Is it suppose to be the Key - on the switch? There is also a pink wire connected to the water temp lamp which I believe provides power to the lamp.
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post #2 of 8 (permalink) Old Jun 30th, 18, 12:00 PM
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Re: 1968 Chevelle Ignition Wiring

Here is a diagram for a 69, very similar and easier to understand.

http://www.replicasuper.com/wp-conte...nd-Sitting.jpg

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post #3 of 8 (permalink) Old Jun 30th, 18, 12:50 PM
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Re: 1968 Chevelle Ignition Wiring

https://www.chevelles.com/forums/27-e...g-diagram.html
this link may have the diagram that you are asking about on elcaminocentral....

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post #4 of 8 (permalink) Old Jul 1st, 18, 12:01 AM Thread Starter
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Re: 1968 Chevelle Ignition Wiring

Thank you for the links to the wiring schematics. I've looked at both of them but they don't really show the exact positions that the wires go to on the ignition switch and I can't seem to find a picture of the pigtail. Does the two green wires that run from the water temp and temp lamp suppose to be connected to the KEY - on the switch? and the GND suppose to be a black wire grounded to the driver side door switch?

According to the wiring schematics, the green wire from the water temp switch and the green wire from the temp lamp connect together in one of the spots on the ignition switch but don't know which one it should connect to?

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post #5 of 8 (permalink) Old Jul 1st, 18, 12:51 AM
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Re: 1968 Chevelle Ignition Wiring

Chevelle Tech - Search Results for 68 ignition switch wiring
try seeing these posts for your answer
seems like i read something about your question,
sorry i domt recall which though...

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post #6 of 8 (permalink) Old Jul 1st, 18, 1:30 AM
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Wink Re: 1968 Chevelle Ignition Wiring

Does this help?
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post #7 of 8 (permalink) Old Jul 1st, 18, 10:11 AM
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Re: 1968 Chevelle Ignition Wiring

Here is some info I have for the ignition switch for my 68 Chevy II Nova:

The backside of the ignition switch:





How I think the ignition switch works (and I would confirm with some tests with a meter) is the switch needs to be grounded so that when the key is turned to the crank position, the green wires connects to ground and then turns on the temp light in the dash serving as a self test to know the dash light works.

Another two connections on the key switch are for the key buzzer circuit and one terminal of the ignition switch goes to the horn relay/key buzzer and the other terminal goes to the secondary terminal of the driver's door pin switch. The driver's door pin switch should have two terminals on it with one acting as the switch for the dome light and the other terminal acting as the switch for the key buzzer circuit.

Basically the ignition switch has three different and separate circuits.

One circuit connects or disconnects power from the battery to either the accessory circuit on the car, or to the ignition circuit on the car, or to the starter solenoid circuit on the car.

The second portion of the switch connects the green wires to the casing of the switch which needs to be grounded to the car so that when the key is in the crank position, the temp light is getting power from the fuse block and now with the ground side of the temp light being grounded in that key position, the light should come on verifying it's operation.

The third portion of the switch has contact points that if the key is fully inserted and the key is in the off position AND the driver's door is opened, the switch is closed and the underhood buzzer portion of the horn relay sounds.

Jim
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post #8 of 8 (permalink) Old Jul 1st, 18, 3:29 PM
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Re: 1968 Chevelle Ignition Wiring

Quote:
Originally Posted by Jim Streib View Post
Here is some info I have for the ignition switch for my 68 Chevy II Nova:

The backside of the ignition switch:





How I think the ignition switch works (and I would confirm with some tests with a meter) is the switch needs to be grounded so that when the key is turned to the crank position, the green wires connects to ground and then turns on the temp light in the dash serving as a self test to know the dash light works.

Another two connections on the key switch are for the key buzzer circuit and one terminal of the ignition switch goes to the horn relay/key buzzer and the other terminal goes to the secondary terminal of the driver's door pin switch. The driver's door pin switch should have two terminals on it with one acting as the switch for the dome light and the other terminal acting as the switch for the key buzzer circuit.

Basically the ignition switch has three different and separate circuits.

One circuit connects or disconnects power from the battery to either the accessory circuit on the car, or to the ignition circuit on the car, or to the starter solenoid circuit on the car.

The second portion of the switch connects the green wires to the casing of the switch which needs to be grounded to the car so that when the key is in the crank position, the temp light is getting power from the fuse block and now with the ground side of the temp light being grounded in that key position, the light should come on verifying it's operation.

The third portion of the switch has contact points that if the key is fully inserted and the key is in the off position AND the driver's door is opened, the switch is closed and the underhood buzzer portion of the horn relay sounds.

Jim
Great illustration and description, Jim. You guys never cease to amaze me how much accumulated knowledge is available here. Hat's off to you!

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