'66 - Switched Ignition Source? - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

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post #1 of 9 (permalink) Old Aug 9th, 18, 12:39 PM Thread Starter
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Doug
 
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'66 - Switched Ignition Source?

66 Chevelle. I cannot find a switched ignition, including during cranking, 12v source. All the fuse block terminals are either full time 12v, or switched, but drop out during the cranking phase. Is there a source anywhere for a switched 12 volts during cranking that I can tap into?
Many THANKS for the help!
Doug
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post #2 of 9 (permalink) Old Aug 9th, 18, 1:06 PM
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Re: Switched Ignition Source

If you still have the stock starter you can use the resistor bypass terminal to supply 12v during crank and a separate 12v keyed terminal.

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post #3 of 9 (permalink) Old Aug 9th, 18, 1:11 PM
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Re: Switched Ignition Source

Doug,you should have a port on the lower right of the fuse panel that's marked "lgn-fused"
seems to me that l used that port to feed the HEI distributor in my first 66 chevelle.
Also need to have a fuse in the reverse lamp cavity for it to be live.
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post #4 of 9 (permalink) Old Aug 9th, 18, 2:19 PM
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Quote:
Originally Posted by BigFred66 View Post
Doug,you should have a port on the lower right of the fuse panel that's marked "lgn-fused"
seems to me that l used that port to feed the HEI distributor in my first 66 chevelle.
Also need to have a fuse in the reverse lamp cavity for it to be live.
That’s the one I use on my ‘66 for the Pertronix, but I think I also have a wire coming from the starter as was mentioned above.
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post #5 of 9 (permalink) Old Aug 10th, 18, 7:33 AM Thread Starter
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Re: Switched Ignition Source

Thank you. I'll give it a try.
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post #6 of 9 (permalink) Old Aug 10th, 18, 7:35 AM Thread Starter
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Re: Switched Ignition Source

I checked it and it's there, but drops voltage during cranking. I'll see if the starter solenoid terminal might work.
Thank you!
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post #7 of 9 (permalink) Old Aug 10th, 18, 7:36 AM Thread Starter
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Re: '66 - Switched Ignition Source?

I'm going to test this terminal as mentioned above. Thank you for the post!
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post #8 of 9 (permalink) Old Aug 10th, 18, 12:12 PM
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Re: '66 - Switched Ignition Source?

IGN terminal WILL drop volts, along with the whole electrical system, when the starter motor is operative, the starter takes a lot of amperes to operate, normal. If the system is in good shape and the engine starts quickly, the voltage drop will be short duration, insignificant.
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post #9 of 9 (permalink) Old Aug 13th, 18, 5:09 AM Thread Starter
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Doug
 
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Re: '66 - Switched Ignition Source?

The EFI again would not start as the starter drops voltage from switched sources at the panel. Only once in awhile, but enough to strand me twice and one time in my shop. Had to install a relay to fully remedy the problem. Holley Sniper does not tell you in the instructions to pick up voltage when cranking as the efi will not start if rpm signal is lost. Of course. Most panels will not have a 12v source during the start phase. My 66 C10 does, however. Chevelle not.
Thanks for all the help!
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