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NAA electrical problems

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Andy Keeney

10-25-2006 10:29:48




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Hi All,
This is my first post in the hopes of getting some help to get my tractor started.

I'm getting no spark to the plugs. We've checked everything from the coil to the plugs and all is new and appear good. Tried another coil, no difference.

It appears that I'm not getting any juice from the wire going to the coil with the started engaged.

I just replaced the solenoid, still no change.

I would appreciate any help that you can give me.

If you need more info, please ask.

Thanks and best,

Andy Keeney
Dewitt, MI

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Andy Keeney

11-08-2006 14:07:52




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 Re: NAA electrical problems in reply to Andy Keeney, 10-25-2006 10:29:48  
Hi All,
Finally got a chance to work on the tractor. I did the following test and got these results.

A local car mechanic that is also into tractors told me to try this.

1. I bypassed the wire that runs from the ingition switch to the input side of the coil by connecting directly from the battery cable to the coil.

2. I took the dist cap off and rotated the engine till the points were open.

3. I took a sparkplug wire and placed it in the coil and placed a sparkplug in the end of the wire and set the plug on a block bolt.

4. I shorted across the points and got a spark at the sparkplug and also a little spark at the points as I shorted them.

Without the jumper wire and with the ignition on, there was no spark.

If I put the distributor back together and with the jumper wire in place, I get no spark at the sparkplug.

Anyone have any idea why I get the spark in the test direct from the coil but not from the distrubutor?

Is there any other test that I can do to figure this thing out?

You thoughts would be appreciated.

Thanks and best,

Andy Keeney
Dewitt, MI

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Andy Keeney

10-25-2006 13:44:14




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 Re: NAA electrical problems in reply to Andy Keeney, 10-25-2006 10:29:48  
Just a thought and a question.

I ran a wire direct from the battery to the input side of the coil. It made no difference, it didn't fire when cranked. I took that same wire and brushed it against a bolt head and it sparked (as it should), so I know I was getting power to the coil.

With the wire still connected direct to the coil input, I took the coil wire that goes to the center of the distributor cap and held it next to the same bolt head and hit the started. I got no spark.

Would this give me an indication that the coil may be bad? Quite possibly the coil that my buddy brought and tried was bad also, or it was good but we had an additional problem with the wiring or connections back to the battery.

Thanks again for your help.

Best, Andy

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dan hill

10-26-2006 02:39:35




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 Re: NAA electrical problems in reply to Andy Keeney, 10-25-2006 13:44:14  
Back to basics.Forget the rotor and distributor cap as a cause of no spark.Take them off.Key off.Bump the starter to get the points open or use a hand crank if you have one.Take the center wire out of the dist cap and hold it a quarter inch from the block.Turn on the key and use a pocket knife blade or thin screw driver blade to short the movable arm to the dist plate.You should see a small spark.When you remove the short you should get a strong blue spark to the block.The NAA ignition will jump a half inch gap with a loud snap.If you dont see a small spark when you short the movable arm to the plate the small copper connector that feeds power to the point arm could be twisted or broken or shorted to the dist plate.Take a look at the condenser lead terminal where it connects to the point arm, it may be touching the plate.Your new condenser could be bad.New points often have a white film on them that must be cleaned off. My 600 has quit running twice when oxides formed on the points.Cleaning with a pocket knife blade got it running.Dont work on anything without a basic understanding of how it works.The NAA ignition is simple and easy to understand.Get an old Motors Auto Manual from the 1960s and learn basic ignition.A simple test light will help in troubleshooting.The light can tell you if points are opening and closing or if you have no power getting to the points because of a short in the distributor.

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jmixigo

10-25-2006 17:23:05




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 Re: NAA electrical problems in reply to Andy Keeney, 10-25-2006 13:44:14  
I would suspect that you don't have two bad coils. Usually even a "bad" coil will generate a spark when it's still cool, one of em should a worked. With voltage to the coil you still gotta have points that are a making and breaking to generate spark. That wire from coil to points can't be broke or shorted no where neither.
This sounds like one of them simple thangs that you done looked at so long you can't see it no more. You can clip a wire from the points side of the coil to ground, then touch the wire from the battery to the hot side of the coil with a plug wire in the coil an a grounded spark plug at the other end of it you should get a spark at that plug ever time you DISCONNECT the battery wire from the coil. If it won't spark like that then get you a coil fore you proceed further.

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old

10-25-2006 15:39:29




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 Re: NAA electrical problems in reply to Andy Keeney, 10-25-2006 13:44:14  
Well since you have spark from the coil wire but not any of the plugs that can only mean you have either a bad cap or rotor, either one or both will cause you that problem. One way to check the cap but you will only do it once is hold onto the cap and crank the engine with the key on. If it zaps the $$@# out of you then you know you have a bad cap. Not a fun or best way to find out but it does find the problem, Guess how I know LOL. Caps get hair line cracks in them and that causes them to ground out the spark and when that happens you loose the spark going to the plugs

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Andy Keeney

10-25-2006 19:43:35




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 Re: NAA electrical problems in reply to old, 10-25-2006 15:39:29  
Hi Old,
It is a brand new cap and rotor and the points and condensor are almost brand new. So I don't think that's the problem.

Thanks, Andy



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old

10-25-2006 19:51:18




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 Re: NAA electrical problems in reply to Andy Keeney, 10-25-2006 19:43:35  
Well if you have a good spark out of the coil wire then it has to be either the cap or rotor. If it wasn't then you would have spark to all the plugs. I've seen more then one cap or rotor be bad right out of the box. Guess thats why I keep all my old parts so when something like what you have I have to old part to try.

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Andy Keeney

10-25-2006 11:55:01




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 Re: NAA electrical problems in reply to Andy Keeney, 10-25-2006 10:29:48  
Hi All,
Thanks for the replies.

I replaced the ignition switch with a new one from the Ford dealer at least several years ago (he is now out of business). Doesn't mean it's not bad though.

I can check the points and get a new condenser although these are almost brand new along with the plugs.

First I'll try jumping from the battery to the coil and see if I get a spark. I'll let you know what happens. Hopefully no big bangs!! :-)

Best, Andy

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old

10-25-2006 11:20:03




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 Re: NAA electrical problems in reply to Andy Keeney, 10-25-2006 10:29:48  
I would start by tring a hot wire from the battery to the coil. If you have spark then you know the problem is from the coil back to the battery. If you still don't have spark then you have a problem in the distubutro area. If when hot wired you have spark then you either have a bad switch or wire or if its a 12 volt system a bad ballast resistor. Now if when hot wired you don't have spark then check the points out real good, the insulator going into the distubutor and or the condenser, seen more then one new condenser bad and if it is bad you will not have spark

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souNdguy

10-25-2006 11:08:13




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 Re: NAA electrical problems in reply to Andy Keeney, 10-25-2006 10:29:48  
Hmm.. no fire tot he coil.. so you replace the coil. No fire to the coil.. so you replace the solenoid.... HAve you thought about checking that wire that goes to the coil.. from the key switch.. seems like that would be the first things I'd check.

Soundguy



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Andy Keeney

10-25-2006 12:54:15




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 Re: NAA electrical problems in reply to souNdguy, 10-25-2006 11:08:13  
Hi Soundguy,
Regarding the coil, a friend that also has a Ford tractor brought an extra coil down and replaced mine with it. there was no change, so I've kept my coil so far.

Best, Andy



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souNdguy

10-25-2006 14:51:15




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 Re: NAA electrical problems in reply to Andy Keeney, 10-25-2006 12:54:15  
Good deal. shotgun de-bugging can get expensive fast.

Soundguy



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jmixigo

10-25-2006 11:00:31




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 Re: NAA electrical problems in reply to Andy Keeney, 10-25-2006 10:29:48  
As Dell would say, it's yore weak sister ignition switch. Ford used the same weak sister switch from back inna 40's till '64. Use a piece a wire to jump the switch. Iffen ya git fire at the points, then buy a new switch-$10 cheap.



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Dan

10-25-2006 10:34:13




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 Re: NAA electrical problems in reply to Andy Keeney, 10-25-2006 10:29:48  
What have you done recently to the tractor before it stopped running?



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