Still No Spark 1950 8N 12v conversion.

   / Still No Spark 1950 8N 12v conversion. #1  

2LateIWon

Silver Member
Joined
Jul 1, 2011
Messages
128
Tractor
AGCO/CAT Challenger MT275
So I've had this tractor for a over a year now and have never had this much problems with it.

So I've replaced points and condenser. No spark changed coil. (it was getting really hot and leaking oil out of the top and it was pretty old so I replaced it anyways) still no spark, Replaced resistor ballist, still no spark replaced wires going from resistor to coil and coil to distributor. Still no spark. I have 12v to resistor. After resistor I have almost 6v. I have almost 6v to the distributor. If I take off the wire from the coil to the distributor it stays @ 12v. So I'm thinking it's the condenser. I switched the new condenser with another new condenser. Still no spark. I need to get this running so I can sell it.

What should I do?

Thanks
 
   / Still No Spark 1950 8N 12v conversion. #2  
Try running a hot wire from the positive battery terminal to the positive terminal on the coil. That will eliminate all the wiring and the resister circuit.
If you still don't have any spark, double check the connections between the points and the condenser to make sure that nothing is grounding out. Also double check that the point gap is correct.

Hope this helps
 
   / Still No Spark 1950 8N 12v conversion. #3  
When you apply 12v to the coil with the points closed , the coil builds up a large field,and when you open the points, the field collapses and the high voltage spark is sent to the plug. The capacitor is there to help keep the points from arcing. You can test the coil with some wires. Remove the high tension wire and lay it close to the block. Apply 12v, and then use a screw driver, short the points and then let off. A blue spark should jump from the high tension to the block every time you short the points and let off.

Check your plugs.
Check your plug wires.
Check the high tension wire to the distributor.
Check the cap.
Check the points.
 
   / Still No Spark 1950 8N 12v conversion.
  • Thread Starter
#4  
Thanks guys!!!
I jumped the coil and there was a small spark (I have the battery charging now after me keep trying to test and crank it) from the coil wire. I grounded the dizzy wire and held the coil wire close to a ground and then let off the dizzy wire and it made a small spark. Shouldn't it be a big bright spark? specially since it's right off the coil? I wonder if that new coil is messed up and not producing enough spark energy to do anything.
Thanks again for the help and I'll make a jumper wire and try it out.
 
   / Still No Spark 1950 8N 12v conversion.
  • Thread Starter
#5  
So I jumped the coil and still nothing. (It did spark a little when I touched it to the coil but I figured it was because I was going from 6v to a full 12v) I made sure nothing was grounded. Still nothing :-(
 
   / Still No Spark 1950 8N 12v conversion. #6  
Is your coil any good? Yes, you should get a fat blue spark.
 
   / Still No Spark 1950 8N 12v conversion. #7  
Make sure all the wiring on the points is in the correct position. When points were the norm on cars I've seen sets were the wiring was grounded to the points frame.
 
   / Still No Spark 1950 8N 12v conversion.
  • Thread Starter
#8  
I think it was just really bright outside. I hooked up another coil and it was about the same. Yep it's hooked up right. (as far as I know)
 
   / Still No Spark 1950 8N 12v conversion. #9  
dizzy feedthru bushing is the next thing to check, assuming the points are opening.

make sure the copper strip from the feedthru bushing is not touching the side of the dizzy too.

soundguy
 
   / Still No Spark 1950 8N 12v conversion.
  • Thread Starter
#10  
from just looking I see nothing touching so I checked the ohms and it read 0.1 (going from wire on out side of dizzy to base or out side of dizzy)so I'm going to check again in the morning and make sure the points aren't closed. (forgot to check while I was bringing my tools in for the night. (hey glad to see ya over here too Soundguy I just started using this forum recently. Your always such a big help)
 

Tractor & Equipment Auctions

New/Unused Self Dumping Hopper (A44391)
New/Unused Self...
2017 Club Car Precedent Golf Cart (A46877)
2017 Club Car...
Ford NAA Jubilee Tractor (A46877)
Ford NAA Jubilee...
Year: 2017 Make: Ford Model: Explorer Vehicle Type: Multipurpose Vehicle (MPV) Mileage: Plate: Body (A44572)
Year: 2017 Make...
2014 UTILITY 53X102 DRY VAN TRAILER (A43004)
2014 UTILITY...
2017 PETERBILT 579 TANDEM AXLE SLEEPER (A43003)
2017 PETERBILT 579...
 
Top