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Ford 9N, 2N & 8N Discussion Forum
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resistor deterioration

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russbWA

01-10-2008 11:25:16




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EvelyN's resistor is quite old and I plan to replace it. I am wondering/speculating though, as the resistor ages what happens?

I'd guess the resistance increases gradually over a long period of time..?~?




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larrh7

01-10-2008 15:23:23




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 Re: resistor deterioration in reply to russbWA, 01-10-2008 11:25:16  
I had problems with mine starting so I went and talked to the old guy at the part store who has worked on 8ns for years. He told me to put in a new resitor and clean up the terminals there. I did that and also ran a new coil wire. That was 3 years ago and it starts right up now with just the old 6 volt system. It can sit in my unheated barn at 0 degrees and starts right up. Cheap easy fix.



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Bob

01-10-2008 14:14:27




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 DON'T be so quick to throw away an OEM resistor... in reply to russbWA, 01-10-2008 11:25:16  
The OEM resistors were "PTC"... they are initially low resistance, for a HOT spark for starting, then the resistance value more or less doubles over the first 30 to 60 seconds, to limit the primary current to protect the coil and breaker points from excessive current and heating.

There have been reports of new ballast resistors (from the "land of ALMOST RIGHT") having resistances that vary all over the place, and are of a fixed resistance, rather than PTC. NOT GOOD.

There should be a number of posts in the archives about this, IF they can be found.

The bottom line is that if you have an OEM resistor, and it's in reasonably good shape, it's probably BETTER to shine up it's terminals and re-use it, rather than taking a "crap shoot" at the quality of a new one.

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don b

01-10-2008 19:04:21




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 Re: DON'T be so quick to throw away an OEM resistor... in reply to Bob, 01-10-2008 14:14:27  
Bob....OEM resistors are available,but most won't pay 5 times the cost of the orientals,but would rather chance it. don b



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Bob

01-10-2008 19:29:09




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 Re: DON'T be so quick to throw away an OEM resistor... in reply to don b, 01-10-2008 19:04:21  
don,

What's YOUR experience been as to the quality of the import stuff (resistance-wise, cold and hot) as compared to the OEM stuff?



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Dunk

01-10-2008 15:39:17




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 Re: DON'T be so quick to throw away an OEM resistor... in reply to Bob, 01-10-2008 14:14:27  
Honestly Bob, I think mine was corroded in the crimp ends.



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JMOR

01-10-2008 19:35:32




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 Re: DON'T be so quick to throw away an OEM resistor... in reply to Dunk, 01-10-2008 15:39:17  
This one (courtesy 'Lurch') was a little high in ohms, but I pealed off the crimp ends, made new galvanized end, crimped to original resistive wire and measured about the values typically quoted hot/cold. Yeah, I know. I don't have enough to do!

1.9v 5.5A 0.345 ohms @t=0

3.95v 4A 0.987 ohms @ 2 min very hot, scorch paper (burnie! burnie! as Dell says!
third party image

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Dell (WA)

01-10-2008 11:56:23




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 Re: resistor deterioration in reply to russbWA, 01-10-2008 11:25:16  
third party image

Russ..... ....naw, resistors are just like lightbulbs, they either work and gitt HOT or they burn-out. The "infamous ballast resistor" ceramic mounting block and the bakelite insulation terminal strip does age from HEAT. Then the connections gitt "flaky" and can become "intermittent" and thus the common recommendation of "clean, brite'n'tite". Iff'n yer unsure about it, replace it. $25 (cheap)

But the most common ignition problem is the weaksister ignition switch. $10 (cheap) ..... ..Dell, yer self-appointed sparkie-meister

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soundguy

01-10-2008 11:49:09




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 Re: resistor deterioration in reply to russbWA, 01-10-2008 11:25:16  
technically.. the restive element should be ok with age.. however vibration can crack the base and break the element.. and the screw terminal contacts can corode.. ( corrosion adds resistance.. )

soundguy



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russbWA

01-10-2008 12:17:21




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 Re: resistor deterioration in reply to soundguy, 01-10-2008 11:49:09  
Thanks SouNd and Dell. So many things to consider. I am leaning toward the round coil Modification with my six volt front mount dist. Just that it is hard to scrap something that works ~ok now.

I hear of one method using a plate instead of hollowing out a coil. Anyone have the clear quill on that?



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soundguy

01-10-2008 12:27:45




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 Re: resistor deterioration in reply to russbWA, 01-10-2008 12:17:21  
third party image

You can make one or wire direct to your cab and distrib.

Look at the bottom of your coil.. there is a pigtail connection tot he points, and a tab to the 4 nipple cap.

If you make a blank adapter, make it so that it fits the top profile good, and has the 2 connections on the bottom.

stiff steel wire. like from a wire welder can be used to make the pigtail. A flat tab from an old rotor botton can be used to make the distribcap connection.

For the kicks of it I mocked one up out of wood.. I then poly-urethane coated it.

drilled it for the 2 connections.. used long machine screws to make the connections and screw terminals.. Also used JB weld putty to fill in the holes and gaps.. Mine even fit on with the original bail.. run a wire from your ignition switch to the coil primary, then fromthe other side of the primary to your pigtail connection. for your secondary comnnection, I stole the tower off an old distrib cap from my dodge truck, tappe dit for a screw and mounted it witht he jb weld, and had the screw holding it from underneath pass thru he flat tab.. makingte electrical connection.

then take the secondary from your round coil and run it to that tower..

zip-bang.. that's it.

here's a shot of the bottom of my blank while it was being built. Had not routed out the area in the rear yet.. etc. also.. that lip around the high volt tab is part of a soda bottle lid.. i added it to keep the same contour as the oem coil.. I undercut the wood and slipepd it in the undercut area and epoxied in..

soundguy

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russbWA

01-10-2008 14:35:02




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 Re: resistor deterioration in reply to soundguy, 01-10-2008 12:27:45  
Soundguy, that picture and description is enough for me to get started on the wood part at least, for now. Thanks, russ



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soundguy

01-11-2008 08:58:25




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 Re: resistor deterioration in reply to russbWA, 01-10-2008 14:35:02  
Not hard to make.. just time consuming.. ( but great to do if you are bored.. )

soundguy



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