'66 ignition switch function - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

 
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post #1 of 7 (permalink) Old Jan 30th, 19, 9:21 AM Thread Starter
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David
 
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'66 ignition switch function

On a original '66 ignition switch:

- key in the "run" position provides 12V out of the switch to the resistance wire, which is connected to the + side of the coil.
- key in the "start" position provide 12V out of the switch to the starter solenoid.

My question is when the key is held in the "start" position - is there still also 12V going to the "run" circuit as well?

(I realize there is another wire coming from the solenoid, back up to the coil to provide a full 12V to the coil during cranking, but here I'm only asking about the function of the ignition switch.)

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post #2 of 7 (permalink) Old Jan 30th, 19, 10:37 PM
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Re: '66 ignition switch function

On a stock 66, the key in the start position and cranking the engine sends 12 volts to the coil from the I terminal on the starter, the wire that has the cloth sleeve has about 9 volts and is a resister wire. Hope this helps!

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post #3 of 7 (permalink) Old Jan 30th, 19, 10:54 PM
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Jon N.
 
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Re: '66 ignition switch function

Short story, no.

The ignition switch does not feed voltage to the coil when the switch is in the start position. That complicates things if you use a starter / solenoid combination that does not supply electricity to the wire going up to the coil.

Jon N.

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post #4 of 7 (permalink) Old Jan 31st, 19, 12:38 AM
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Re: '66 ignition switch function

Quote:
Originally Posted by RAIDER SS View Post
On a original '66 ignition switch:

My question is when the key is held in the "start" position - is there still also 12V going to the "run" circuit as well?

One way to know for sure. Disconnect the return wire from the starter solenoid to the coil and check for voltage at the + terminal of the coil.
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post #5 of 7 (permalink) Old Jan 31st, 19, 1:12 AM
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Re: '66 ignition switch function

Quote:
Originally Posted by dyno jonn View Post
Short story, no.

The ignition switch does not feed voltage to the coil when the switch is in the start position. That complicates things if you use a starter / solenoid combination that does not supply electricity to the wire going up to the coil.
That is incorrect... At least for 1966.

I converted my previous '66 to an HEI, and I not only eliminated the wire from the starter solenoid, but I "bypassed" the resistor wire by splicing in a regular wire at the firewall bulkhead connection (after wrapping, it looked like a stock harness)... Full 12-volts at the coil in both "run" and "Start" coming from only that one single wire...



But it has been a few decades, so I just went out to the garage and checked.

I have a restored factory dash wiring harness and a new ignition switch (both out of the car). I plugged in the new switch and performed a continuity test, and while the "wire" to the solenoid only receives power (continuity) in the "start" position (against the return-spring tension), the "coil" circuit receives power (continuity) in BOTH the "run" and "start" position...

Not sure if all other years are similar or not, but that's the way it is on a '66...


Quote:
Originally Posted by Raider SS
On a original '66 ignition switch:

- key in the "run" position provides 12V out of the switch to the resistance wire, which is connected to the + side of the coil.
- key in the "start" position provide 12V out of the switch to the starter solenoid.

My question is when the key is held in the "start" position - is there still also 12V going to the "run" circuit as well?
The answer is Yes...

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post #6 of 7 (permalink) Old Jan 31st, 19, 9:26 AM Thread Starter
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Re: '66 ignition switch function

Quote:
Originally Posted by 1966_L78 View Post
I converted my previous '66 to an HEI, and I not only eliminated the wire from the starter solenoid, but I "bypassed" the resistor wire by splicing in a regular wire at the firewall bulkhead connection (after wrapping, it looked like a stock harness)... Full 12-volts at the coil in both "run" and "Start" coming from only that one single wire...

I have a restored factory dash wiring harness and a new ignition switch (both out of the car). I plugged in the new switch and performed a continuity test, and while the "wire" to the solenoid only receives power (continuity) in the "start" position (against the return-spring tension), the "coil" circuit receives power (continuity) in BOTH the "run" and "start" position...

The answer is Yes...
Thank you for your efforts, Tony!

My dash is properly wired and installed, but I am not close to putting 12V to the car yet. That is why I'm asking versus trying to jury rig a test on my car.

I'm re-doing some of the botched up wire harness for the engine, and I'm running a new 12V wire instead of the resistance wire to the coil. I'm installing the MSD ready-to-run distributor that doesn't use the MSD ignition box, but instead utilizes the stand alone coil. This only requires a 12V source to the coil at all times (even during cranking), so similar to what Tony did with his HEI system - I'm looking to see if I can eliminate the additional wire from the starter solenoid back up to the coil. According to Tony's findings - I can.

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post #7 of 7 (permalink) Old Jan 31st, 19, 9:45 AM
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Jon N.
 
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Re: '66 ignition switch function

Quote:
Originally Posted by 1966_L78 View Post

That is incorrect... At least for 1966.




The answer is Yes...

I'll accept a real live test over theory anytime. I never physically checked a 66 switch, but I have on many others. I had to rewire a 66's differently for an amp gauge years ago because the regulator wiring didn't work exactly how the included instructions said it should work. Color me surprised.

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