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Re: 53 Jubilee loses spark. Need troubleshooting help

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Dell (WA)

11-10-2012 16:24:39

Report to Moderator write........"dist side: 6V open, 4.5V closed"........yer points when closed are GROUND and you should read ZERO volts. Your points are BURNED and are resistive, therefore you read about 4.5-volts with the points closed. Ittza LAW, Kerchoff's Law. Do I haffta tell you to replace yer BURNED points???

Remember to POLISH the INVISIBLE corrosion from between the new points. Me? I use a clean $1-bill clamped between the closed points and pull. Iff'n yer really cheap, tear a strip from HEAVY brown paper grocery sack and use that. ........Dell, yer self-appointed sparkie-meister

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William Fissell

11-10-2012 17:54:26

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 Re: 53 Jubilee loses spark. Need troubleshooting help in reply to Dell (WA), 11-10-2012 16:24:39  
@Dell - thank you!

That's what I was thinking.... except...

when I put the voltmeter on the 'hot' point, its 6 (open) or zero (closed) so at the points.. they are grounding and not generating a voltage across the closed points. ... so I was trying to decide how 4.5V was getting dissipated in that little length of wire from coil to points.

Kirchoff's voltage law: the sum of all potential drops around a closed circuit must sum to zero

Kirchoff's current law: the sum of all currents leaving a given node must sum to zero.

Sounder: yeah, I couldn;t figger out why I ddn;t have spark either.. "you should have spark" ... I thought so too.

What would a bad condenser act like? either a short to ground (no) or...



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11-10-2012 18:27:26

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 Re: 53 Jubilee loses spark. Need troubleshooting help in reply to William Fissell, 11-10-2012 17:54:26  
if the condensor was shorted.. it would act like closed points.

if condensor was open.. it would let points arc and burn pretty quick.

you get some that self heal a bit then die out in a few minutes with warmth..e tc. but it's more rare.

run a hot wire to the coil.

clean points and regap.

use that known good coil.

see what you get with just the coil.. forget the dizzy cap..

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William Fissell

11-10-2012 18:59:18

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 Re: 53 Jubilee loses spark. Need troubleshooting help in reply to soundguy, 11-10-2012 18:27:26  
OK, will try again. feel like I did all that - new coil, wire from coil to spark plug, regapped the points and dressed 'em wiht a card... still nada.

I am puzzled that it's 4.5V on the dizzy side of the coil and 0V on the points... how could a 6" piece of copper drop 4.5V - it can't!

So, where is the likely resistance "point" - at the dizzy feedthu?


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11-12-2012 06:02:23

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 Re: 53 Jubilee loses spark. Need troubleshooting help in reply to William Fissell, 11-10-2012 18:59:18  
chances are if it's dropping that.. it's a very bad connection somewhere else.. that's why i mentioned using a hot wire as a jumper to the coil. if it still drops 1.5v on other side of coil before dizzy.. that leaves you but one place to look.. at the feedthru.. and wy less likely.. the condensor.

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