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Field testing an ignition syatem

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Rusty Nail

06-13-2001 10:57:21




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I am a member of this "board" and since this tractor is a Ferg TO-20 (It's my buddys) I think all of you good fellows can give me an answer just as good as the boys over on the other side, What ever the procedure that is recomended could be use on most all of the gas tractors around.

What procedure(s) could one use to check out the complete ignition system in the "field" ( along way from home) with only a couple of pieces of wire in his truck. The tractor will turn over (has a new battery also has an external coil) This tractor has been setting for a couple of years. Fresh fuel is getting to the carb.
1) How to check out the coil for spark.
2) How to check out the points to make sure they are operating correctly.
3) How to check out the condenser.

Next question: What would be the minium tools etc to take back to the field to do the testing.

Thanks in advance

Rusty Nail

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DonTN

06-13-2001 12:20:26




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 Re: Field testing an ignition syatem in reply to Rusty Nail, 06-13-2001 10:57:21  
If I suspect ignition problems the first thing I do is remove the spark plug, leave it connected and the metal touching the block (so it will ground) and turn the engine over with the starter. If it sparks, you have fire and you probably have a fuel or timing problem. If it doesn't spark then you start checking out the distributor, coil and etc.If an engine won't start you have either a fuel or electrical problem (or both) and this will at least tell you which general direction to look.

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Jhill

06-13-2001 11:24:39




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 Re: Field testing an ignition syatem in reply to Rusty Nail, 06-13-2001 10:57:21  
I start with a screwdriver and a charged battery
Take off the cap turn engine over so points are closed. remove coil wire from cap. turn on ignition and use screwdriver to open points. Yuo should get a spark at both points and coil. If not I would start by fileing points and checking electrical connections.



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Claus

06-13-2001 11:20:27




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 Re: Field testing an ignition syatem in reply to Rusty Nail, 06-13-2001 10:57:21  
External coils are a piece of cake. Remove the distributor cap and roll the tractor slightly to get the points open. Then remove the center coil wire and hold it about 3/16" away from a ground. Use gloves or a rag so you do not get shocked. Then take a wire from the distributor side of the coil and momentarily short it to ground. Then the short is no longer there, then you should see a nice blue spark. You could accomplish the same by
taking a screwdriver and shorting out the points.
The points should open and close as you crank the engine. If you do not get spark with this procedure, you either are not getting current to the coil or the coil could be defective. The capacitor (Condenser) is best checked by replacement as they are difficult to check in the vehicle. Tools, a screwdriver, piece of wire, If you can get hold of a meter to check the voltage at the input of the coil it would help also. Should be battery voltage with the points open. If the system utilizes a ballast resistor then expect to read about 3 - 4 volts on the input to the coil and the points would have to be closed for this test.
Happy Motoring
Claus

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