Electrical Problem

[Andy Keeney]

Hi All,
I'm still having trouble with my NAA. I'm not getting a spark from the coil and an electrician friend advised that there was no current getting to the coil.

I had the distributor rebuilt, a new coil, new 6V battery and the black solenoid unit that the battery negative post connects to was replaced.

I just bought a voltage regulator but have not installed it hoping to be able to test the one in the tractor before I do so.

My questions are:
Could it be the regulator that is giving me problems? Can that cause no current to the coil.

Is there anything else that you can think of that I can check to determine why there is no current at the coil?

Thanks for your help.

Best, Andy Keeney

 

[TimPa]

i'm not real familiar with the naa. does the ammeter needle toggle back and forth when the key is on and the engine is cranking over? this is from the points opening and closing showing current going through the ignition circuit.

 

[Bob]

The voltage regulator WON'T affect spark at cranking. (Unless someone's really cobbed up the wiring!)

Whip out your test light.

Got power at the battery cable terminal of the starter solenoid? (HOPEFULLY!)

Follow the wiring from there to the coil 'til you find out where the current "stops" and make repairs as needed.

<img src = "http://web.archive.org/web/20030412031301/http://www.nseries.com/naa.gif">

This is a good diagram with the exception of the depiction of the coil. The wire from the ignition switch/terminal block will actually go to the "BATT" or (-) terminal on the coil, with the "Dist" or (+" terminal going to the distributor.

(The diagram makes it apear the wire from the switch/terminal block goes to the coil's center terminal, NOT correct.)

 

[Andy Keeney]

Thanks for the reply. I did try the new voltage regulator with nil results so I put the old one back in.

One of my friends was wondering if there could be a problem with ground but if the starter engages okay, can there still be a ground problem?

Thanks again for your help and the diagram. That will be very helpful. I'll try and follow that through to see if I can find the dead spot.

 

[Andy Keeney]

Hi Tim,
I'm not sure myself. It's been over a year since I got to use the tractor. Maybe someone else knows.

Thanks, Andy

 

[souNdguy]

Jumper right from the battery to coil primary and test for spark..If ya get spark.. somewhere in your wireing to and from the key.. ya got an open.

soundguy

 

[old]

Could be as simple as dirty points and if they are dirty you will not get a spark any place
Hobby farm

 

[Andy Keeney]

Hi Soundguy,
Thanks for your suggestion. I"ll try that tomorrow and let you know. I"m at work til late this evening. Winter"s supposed to be here in Michigan by this weekend so I hope I can figure it out before the snow flies!!

Best, Andy K

 

[Andy Keeney]

Hi Bob,
Is it possible for you to send the diagram directly to me? I see that it is no longer available on this site and I didn't have a chance to print it out.

[email protected]

Thanks and best,

Andy K

 

[souNdguy]

points based systems are as easy as it gets for ignition.. need spark, air, fuel, and compression.. all at the right time..

soundguy

 

[Andy Keeney]

Hi All,
I did some testing with the meter. Now I"m no expert when it comes to the meter or electricity but that being said, I found the following.

I jumped the different parts of the system stating at the battery to ground and working out to the coil. I have 6+ volts at the coil, both in and out (+ & -). When we engaged the starter with the ignition on, the voltage drop below one volt at the coil. So following back to the starter solenoid, I got less that one volt on the output of the solenoid when the starter was engaged with the ignition on and kept the (approximate) 6 volts on the input side of the solenoid coming from the battery with the starter engaged.

Any thoughts on this? Bad starter solenoid? Anything else I can check?

Thanks and best,

Andy Keeney
Dewitt, MI

 

[Andy Keeney]

Hi All,
I posted this in the wrong slot and was afraid it would be lost so I'm posting it again. Sorry for any duplication.
=======================================

I did some testing with the meter. Now I"m no expert when it comes to the meter or electricity but that being said, I found the following.
I jumped the different parts of the system stating at the battery to ground and working out to the coil. I have 6+ volts at the coil, both in and out (+ & -). When we engaged the starter with the ignition on, the voltage drop below one volt at the coil. So following back to the starter solenoid, I got less that one volt on the output of the solenoid when the starter was engaged with the ignition on and kept the (approximate) 6 volts on the input side of the solenoid coming from the battery with the starter engaged.

Any thoughts on this? Bad starter solenoid? Anything else I can check?

Thanks and best,

Andy Keeney
Dewitt, MI

 

[Andy Keeney]

I went ahead and got another starter solenoid but this one has the same dropage of volts as the old one. With the starter engaged and ingnition on, It keeps 6 volts going into the solenoid but right around 1 volt coming out. Getting very frustrating!! Looking forward to your thoughts. Thanks for your help.

I'm heading to work for the afternoon shift. Looks like tomorrow morning is my last chance at half decent weather!

Best, Andy Keeney

 

[Andy Keeney]

Think I'm getting a little closer to the problem. Talked to a mechanic and after describing the voltage drop across the starter solenoid, he thinks I may have a short in the distributor. I will disconnect the wire from the minus post of the coil and see if I still get the drop in voltage at the solenoid when I hit the starter. If not, I think I'll have it figured out and will have to find the short in the distributor. Will let you know what I come up with tomorrow.

Thanks all for your help.