JD 40 - 12 Volt system

[Johnny G]

Need help:12 volt wiring
I have 12 volts from ignition wire at switch and then I go thru an external resistor and have 5.36 volts at negative side of coil and on positive side at distributor I have .43 volts. What sould the voltage be?????????
I have a 6 volt wiring diagram but I am confused.

 

[TURNER]

since your going 12v, do you want to sell the generator?

 

[John T]

It sounds like your points are carboned n burned. You might to non abrasively clean/buff/polish them and check the gap but if they are badly burned or pitted a points file or fine aluminum oxide may temporarily refurbish them. If a bad burning or pitting ID REPLACE THEM..

With a 12 volt tractor and assuming you have an external series voltage dropping (12 to 6) ballast resistor after the switch before and ahead of the coil, the voltages Id expect would be APPROXIMATELY and with ignition and and points CLOSED.

12.6 on switches IGN output (and on high input side of ballast)

Around 5.5 to 6.5 on low output side of ballast and/or at coils input (i.e. NOT its to distributor terminal)

NEAR ZERO VOLTS on the coils low output (or lil distributor side terminal). If a good set of non carboned or points are closed that voltage with respect to ground should go to dead zero as the points are closed n grounded (assuming closed NOT up on high cam). If theres voltage on the distributors input terminal (coils low output to dist terminal) when the poinst are closed theres a voltage drop across them due to carbon or burning which causes a weak spark.

If its a 6 volt converetd to 12 tractor and its still an original 6 volt coil the ballast is needed unless you tossed it and replaced the coil with a full true 12 volt coil no ballast required.

If you need my complete ignition troubleshooting procedure for non sparking post back

John T

 

[Johnny G]

John T
I need your complete ignition troubleshooting procedure for non sparking.

 

[Johnny G]

John T
I need your complete ignition troubleshooting procedure for non sparking.

 

[John T]

http://www.ytmag.com/cgi-bin/viewit.cgi?bd=farmall&th=5745
Troubleshooting

 

[John T]

http://www.ytmag.com/cgi-bin/viewit.cgi?bd=farmall&th=5745
Troubleshooting