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8n won't start after installing new points/condenser kit. 12v conversion, had jumper wire from top of point to condenser wire??? It would shut off after getting warm, now no spark to plugs. Any ideas?

Converted to 12 volt by prior owner New points, condenser kit installed. I just bought an 8n and it seemed to run fine. Got it home and let it run while hooking up attachment for about 10-15 minutes and it began running rough and eventually shut off and wouldn't start. After it cooled down a bit, it fired right up and ran again until it got warm. It was converted to 12 volt by previous owner. I put new points and condenser gapped at .015 and won't start. No spark to plugs now either. The old points had a jumper wire that I don't believe was factory. It was mounted to the screw at the top of the point where to 2 thin strips of metal copper & stainless connect at the insulator and then the jumper mounted on the other end where the condenser wire was secured under the screw. I don't understand why this wire was there and if that was allowing the current to go to the spark plugs before. I installed it the way it should be without the jumper wire and the tractor will turn the engine over but not start. It is getting fuel. Any ideas?

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  • Brian Kerling
    Brian Kerling Mar 31, 2015

    I finally figured out that the jumper wire was replacing a copper spring type tab that mounted to the top of the points and made contact with the bottom of the screw that held down the wire coming from the condenser. I fabricated the copper tab from the old copper strip in the old points and installed it. Now it runs like a top.

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SOURCE: 8n (front mount distributor)seems to be frying

Had the same problem, but was my fault for bypassing the ballist resistor (my bad). Anyway, I fried the coil. Read all the posts and bought new 12 volt coil (it has been converted before I got it 13 years ago). New points, condenser, cap, rotor. Now it is just my timing is a little off, but I have strong sparky but not enough to fry my coil again.

If anything, keep the ballist resistor. it is needed to drop the voltage to the coil so it doesn't fry.

Posted on Dec 30, 2010

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Cant get 8n to run. starts but misses. new plugs, crb,distributor, coil, tank shut-off, ign switch, ceramic resister, ballast resister, fresh gas, but has power to ign switch whether on or off.


If it starts but misses meaning it runs but not on all cylinders?.....then,
Are the spark plug wires in the correct firing order?
Are the spark plug wires in good shape?
Is there compression on all cylinders?
If a valve is bad it won't fire smoothly.
If you pull the plugs are any black with carbon?
(a black carbon coated plug will not fire,especially with a 6 volt system)
Is the distributor car attached fully and correctly?
When the distributor cap is off,is there any side play in the distributor shaft?
Is the point gap correct on the points?
Start the tractor cold and feel the spark plugs,the one or two that are colder than the others are the missing cylinders,if two are cold you could try switching those spark plug wires with each other,in case they are mixed up,and if two are missing are side by side you could have a head gasket leak between cylinder problem.
TIP 1, the BEST THING to do on a Ford 8N is to convert it to 12 volts neg ground.Add a alternator,(76 chev pickup alt fits good) leave the starter as it is (it does care if it's positive or neg ground or 12v) and add a 72 dodge ignition resistor in line to a 12 volt coil.(unless your new 12v coil does not need a resistor)
This set up will increase your fuel economy,add power and start instantly in any temp.
TIP 2,you can use unleaded fuel in a Ford 8n as it already has hardened valve seats.
BUT 10% Ethanol fuel is BAD,it can be used, but shut off the fuel at the tank and let the tractor carb run dry before shutting it off if you are not going to use the tractor with in a few days.

May 21, 2017 | Cars & Trucks

1 Answer

I have fire at coil but no fire through sparkplug wires


The problem sounds like it is your distributor. Replace the ignition points and condenser, make sure the points are gapped properly. If you still don't get fire at the plugs, change the distributor cap, rotor, and wires. Points and condenser kit runs $9.72.

http://www.yesterdaystractors.com/ATK7FA_Ignition-Kit-4-Cylinder_14717.htm?gclid=CJzJscSG47sCFXPNOgod31wAqA

Jan 03, 2014 | Ford 8N Tractor

1 Answer

Won't start !! converted to 12v ,new starter and solenoid installed along with new coil,points,roto cap now no spark to plugs


Cranks? Check voltage to + side of coil,first. 10 V. OK.
Be sure that points open and close.SEE it as it cranks.
Points gap should be around .016 "
If you open and close the points,key on,engine off,the coil should SPARK!
Use a screwdriver to get a shock. Fun.
Sorry.
The coil will spark when you short the points,when they are open.

Mar 17, 2013 | Ford 8N Tractor

1 Answer

8n (front mount distributor)seems to be frying coils, one day working just fine, next doesn't spark at all, New condenser, plugs, wires, rotor,points, distributor cap. Replaced coil last time seemed to...


Had the same problem, but was my fault for bypassing the ballist resistor (my bad). Anyway, I fried the coil. Read all the posts and bought new 12 volt coil (it has been converted before I got it 13 years ago). New points, condenser, cap, rotor. Now it is just my timing is a little off, but I have strong sparky but not enough to fry my coil again.

If anything, keep the ballist resistor. it is needed to drop the voltage to the coil so it doesn't fry.

Jan 12, 2010 | Ford 8N Tractor

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No spark at spark plug center of Coil


2000 ford escort ZX2. 4cyl . No spark at the spark plug. Wires are good.

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Check for power getting to the center top connection at the coil.
Are the points opening?
Are they fully closing?
Check for a grounded connection/wire in the dist?
Be very careful how you set the coil onto the dist.

Jul 12, 2009 | Ford 8N Tractor

1 Answer

Ford 8N wont start


It sounds like the conversion was more trouble than it was worth. I won't claim to have the solution to your problem having never worked on an 8N, but I was wondering about the capacity of the points and condenser in the distributor. If the condenser is not 12 V also, it might be causing the points to melt which would keep from getting a spark at the plugs. Check the condenser for voltage rating and also check if you are getting a spark at the plugs by unscrewing a plug, reconnecting the high tension lead, and hold the edge of the plug against the block while cranking using thick leather gloves, insulated pliers, rubber, or other non-conductive material to keep from getting shocked.

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No spark to my ford 9n tractor


you are in the wrong place that is the battery regulator. go to the distributor and pull the cap where you see the four spark plug wires. Inside you will see a set of points and a condenser. there you should have 12 volts. Get back to me after that. donnyb60

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