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Old 08-27-2017, 04:30 PM   #1
Darrell Kinnan
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Default Hairline crack on back of ignition switch

Found a hairline crack in the bakelite on the back of a 36 ignition switch. Crack is noticeable on the inside but not on the outside. Apparently the two screws that hold the bakelite and the two brass posts in place were tightened too tight. Would this cause some ignition problems I'm having?
DK
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Old 08-27-2017, 05:15 PM   #2
VeryTangled
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Default Re: Hairline crack on back of ignition switch

Hi Everyone, Here's some more on DK's issue. Sorry but I'll have to stay out of the cracked ignition switch question.

https://www.fordbarn.com/forum/showthread.php?t=227495
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Old 08-27-2017, 05:17 PM   #3
Init1
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Default Re: Hairline crack on back of ignition switch

You could test the switch. Bypass it and see if your engine runs better.
That part of the switch with the posts is repopped. And so is the little switch part. The metal enclosure is not.
Maybe replacing the switch would be prudent anyway.
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Old 08-27-2017, 11:59 PM   #4
Lawson Cox
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Default Re: Hairline crack on back of ignition switch

Quote:
Originally Posted by Init1 View Post
You could test the switch. Bypass it and see if your engine runs better.
That part of the switch with the posts is repopped. And so is the little switch part. The metal enclosure is not.
Maybe replacing the switch would be prudent anyway.
Yes, but use as original, as repo switches aren't much good.
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Old 08-28-2017, 12:15 AM   #5
Ken/Alabama
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Default Re: Hairline crack on back of ignition switch

What Lawson said !! Bought one for a 40 a few years back. I could have done better with a beer can after a twelve pack !!��
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Old 08-28-2017, 09:08 AM   #6
Seth Swoboda
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Default Re: Hairline crack on back of ignition switch

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I once had a problem with an ignition switch in a '46 coupe. It's been a few years ago (I was 16-17 and 37 years old now) and I can't remember the symptoms or how I found it but when I replaced the switch all was well again.

Is there a way you can test the switch while it in the car with a voltmeter?
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Old 08-28-2017, 11:25 AM   #7
carguybill
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Default Re: Hairline crack on back of ignition switch

" Is there a way you can test the switch while it in the car with a voltmeter?"

I tested mine by measuring the voltage to ground on both sides of the switch with the switch in the on position. There should be no perceptible difference in the voltage readings. If there is then there is resistance across the switch and repair or replacement is needed.

In my case I measured 6+ volts on one side and less than 4 volts on the other side.
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Old 08-28-2017, 12:53 PM   #8
Seth Swoboda
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Default Re: Hairline crack on back of ignition switch

Quote:
Originally Posted by carguybill View Post
" Is there a way you can test the switch while it in the car with a voltmeter?"

I tested mine by measuring the voltage to ground on both sides of the switch with the switch in the on position. There should be no perceptible difference in the voltage readings. If there is then there is resistance across the switch and repair or replacement is needed.

In my case I measured 6+ volts on one side and less than 4 volts on the other side.
Thank you!
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