Okay Dave, based on your update heres the answers once more, although what I posted below should have already covered this:
1. 6v tractor but runs with a 12v battery
"THE IGNITION IS 12 VOLTS TO START WITH THEN"
2. No gen/alt-fires off battery (yep, charge at night)
3. No switch. He likes it simple (turn the tractor off-pull the ign wire off the battery.
4. Voltage to coil reduced to 6v w/ external ballast.
"THAT MEANS YOU NEED TO USE A 6 VOLT COIL NOT A 12" (or else toss the ballast and use a 12 volt coil)
5. Fact-old 6v coil works this way (from another M),
"THATS RIGHT, SINCE YOU HAVE THE VOLTAGE DROPPING (12 to 6) BALLAST, A 6 VOLT COIL SHOULD WORK
2 new 6v coils from Napa don't. These coils are the ones that their books say work. These coils say "No external coil required" on the case.
IF THE NEW COILS ARE INDEED 6 VOLT COILS I WOULD EXPECT THEM TO SAY NOOOOOOOO EXTERNAL BALLAST butttttttttttttttt 6 volt coils dont usually carry such a label since they dont normally use any ballast anyway (sure theyre not 12 volt internally ballasted coils???)
HERES WHAT COULD BE THE PROBLEM:::::::::::
Those new NAPA coils may be 12 volt coils what some people refer to as "internally ballasted" and if thats so, they indeed SHOULD NOT HAVE ANY EXTERNAL BALLAST butttttttttttttttttttttttt SINCE YOU ARE STILL USING THE OLD BALLAST YOURE ONLY PUTTING 6 VOLTS TO THEM (versus the 12 they need)
ONCE MORE (already posted below) HERES WHAT YOU NEED TO USE SINCE ITS A 12 VOLT BATTERY:
EITHER a) A full true 12 volt coil AND DO NOT USE ANY EXTERNAL BALLAST PERIOD (like if you try an automotive 12 volt coil)
OR b) A 6 volt coil BUT LEAVE THE EXTERNAL BALLAST
I suspect those NAPA coils may be 12 volt internally ballasted and since you still have the ballast youre only putting 6 votls on a 12 volt coil causing a weak spark
Once you figure out the coil (this post or my previous) thing my Troubleshooting Procedure posted below will provide the other answers
best Wishes, let us know !!!!!!!!!
PS if you have an ohmmeter, the way to tell if the NAPA coils are 6 or 12 volt is to measure the primary resistance between the lil + and - terminals....... 1.25 to 2 ohms is probably a 6 volt coil.........2.5 to 3.5 is probably as 12 volt coil
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