Question about Ford 8N Tractor

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Do you need the resistor on 8n between ignition and coil

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Posted on Jan 02, 2017

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SOURCE: 12 volt 8n ford will not fire, no spark at first plug

Take the wire off the coil and check the wire for voltage.while it is disconnected.
If there is voltage now....... the problem is in the dist or coil.
Pull the dist and check for something grounding the system.
Are the points opening?

If there was no voltage in the resistor to dist wire....install a new wire.

TIP. Be careful how you set the coil onto the dist.

Posted on Aug 13, 2009

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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 a 1952 ford 8n new wire harnes when i hook up hot wire from voltage reg it clickes is it supposed to do that


It is the field coil energizing. Normally it should not be energized. Double check how you have the ignition switch wired..

Oct 23, 2012 | Ford 8N Tractor

1 Answer

8N rpms keep falling


I run one number hotter plugs in my N tractors as they tend to foul plugs.
Glad it was a simple fix.

Apr 28, 2010 | 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

1 Answer

Resistor fuse getting very hot


Does the tractor run?
The resistor should get hot in normal operation.
Never leave the key on with the engine not running on any vehicle with points type ignition.

Sep 13, 2009 | Ford 8N Tractor

1 Answer

No spark for 2n tractor put on a new 12 coil changed points and condersor was runing before i burned out 6 v coil


check the resistor mounted on the back side of the dash, resistor dead no spark. you can strap it with wire to see if it fires, dont run it this way.

Jun 28, 2009 | Ford 8n,9n,2n, Tractor Starter With Drive

3 Answers

Ford 8N will not start when hot


This sounds like a bad fuel pump to me. The only way to be sure is to check the fuel pressure when cold, probably around 45 PSI. Then when it get hot it will drop way down to 10 or 15 PSI. Check the pressure if you can, or change the fuel pump.

Jun 12, 2009 | Ford 8N Tractor

1 Answer

12 volt 8n ford will not fire, no spark at first plug


Take the wire off the coil and check the wire for voltage.while it is disconnected.
If there is voltage now....... the problem is in the dist or coil.
Pull the dist and check for something grounding the system.
Are the points opening?

If there was no voltage in the resistor to dist wire....install a new wire.

TIP. Be careful how you set the coil onto the dist.

Jun 04, 2009 | Ford 8N Tractor

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