No Spark

FarmallJoe · Jun 20, 2008

I am working on fireing up my A. I just put in new wires and plugs. I"m not all that sure about electrical symstems and dont understand solonoids ets.

Anybody have any answers??
thanks a lot.

Vern · Jun 20, 2008

Clean the points.

Vern

Jerry/MT · Jun 20, 2008

Check the points for corrosion, oil, burning or pitting and make sure they are set correctly. Make sure that the wire form the coil to the sistributor is attached to the coil termonal with the same sign as the battery ground. Make sure that all your connections in the primary circuit( battery to key switch to solenoid to coil to distributor) are clean and tight and the insulation on the wire is good. Check the primary side of the coil for continuity. Make sure the cap is in good condition and the sockets don"t have corrosion in them. Set the recommended gap on the plug. Are your spark plug wires copper core? If not they should be. Do not use modern carbon core auto plug wires on a gas tractor. Sometimes key switches go bad. Jumper across the key switch and if you get a spark when the jumper is attached, your key switch is bad.
DO all these checks sytematically and check for a spark after each change you make. Write down the results for future analysis. If you do that you"ll find the problem and know what caused it.

Andy Motteberg · Jun 21, 2008

Do you have a magneto or distributor ignition? Be sure the points are clean and the gap setting is correct. Make sure the condenser, coil, cap and rotor are in good condition. If you have a magneto, make sure that the magnet is strong and be sure it impulses (snaps) well.

El Toro · Jun 21, 2008

Your solenoid is what feeds battery voltage usually to your ignition switch for the tractor's ignition if it has a distributor & lights. It also feeds voltage to the S terminal on your solenoid when you twist the key or push a button to start the engine and this energizes the bendix
drive on the starter to crank the engine. There's only voltage on the S terminal when cranking. You need to use a volt meter to check for voltages and if you don't feel comfortable get a buddy to help you. Hal

RAB · Jun 21, 2008

A solenoid is a magnetic switch operated/powered/produced by current passing through a coil.

Usually only the starter uses a solenoid on a spark ignition engine. It should have no bearing on whether a spark is available excepting the case where there is a full voltage feed to the coil while cranking and using a 6 volt coil.

In this instance the coil would be fed the full 12 volts via the solenoid while cranking and then only a 6 volt feed through a ballast resistor when running (a wire from the ignition switch).

I don't think this is your problem, but it might be distracting you from sorting out the actual one.

Regards, RAB

HENRY E NC · Jun 21, 2008

You haven't said whether it is 6 or 12 volt, battery or magneto ignition. In the case of a farmall A no solenoid is needed if you use a starter button. Most buttons mount on the starter and act as a solenoid. If it has been converted
to 12 volt and uses the battery for ignition (distributor and coil) the same applies. In any case solenoids are not required unless you are using a key starter switch. MY a has magneto ignition and 6v positive ground starter. NUff said Henry

No Spark

FarmallJoe

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Vern

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Jerry/MT

Well-known Member

Andy Motteberg

Well-known Member

El Toro

Well-known Member

RAB

Well-known Member

HENRY E NC

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