Bad coil? Double checking....

I pulled all three leads off the coil on the 300U. I set my little VOM meter at Rx1 on the Ohms scale. When I measured across the two small leads I get no reading. Am I doing this right and does that mean the coil is bad? Appreciate the help. I am following John T's checklist.

Set the meter to a higher scale; there needs to be continuity between the 2 primary terminals and between either primary and the secondary (spark) terminal.

Thanks Wayne...I already figured it out. Just came in. When I left the key on I burnt up the points and the old coil checked out too. I have a couple others waiting to be worked on so I pulled the coil off a Farmall B. Appeared to have the same coil...hope so anyway. 12 volt, no resistor. I checked it with the meter and it gave me a reading on all scales. So I put it on the 300U and it fired up for me. I ran it around a bit. Seems OK at full throttle although it seems to lose power on hills. Doesn't want to idle though...stalls. I don't recall how to adjust that so I'll need to find the book if I have one. Unless someone wants to give me a crash course/reminder on carb adjustment? I've done it, just not in a couple years.

If it has a 12V coil, you might want to add in a resistor to keep from burning out the points. As far as losing power on hills, I would think that the governor needs to be adjusted. This is something that is best done with the help of the service manual. The carburetor can be adjusted by turning the mixture screws in for a richer mixture, or out for leaner.

What carb do you have on it?

If that coil is a factory coil you need a Ballast resister in line with it or your going to burn up the point fast and or burn out that coil

"I pulled all three leads off the coil on the 300U. I set my little VOM meter at Rx1 on the Ohms scale. When I measured across the two small leads I get no reading. Am I doing this right and does that mean the coil is bad?"

YES and YES

If the meter is working okay??? there should be a reading of somewhere around 1.25 to under 4 ohms (depends if 6 or 12 volt coil) through the coils low voltage primary winding between the coils small + and - terminals. R x 1 would be the correct scale. If you touch the leads together the meter should register near zero ohms, does it??? If its an analog meter and the needle doesn't move at all and is working okay, sounds like the coil is burned open and YES THATS BAD.

If you have applied 12 volts on a 6 volt coil a long time and NOT used a series voltage dropping (12 to 6) current reducing ballast resistor THE COILS LV PRIMARY MAY HAVE OVERHEATED AND BURNED OPEN ie infinite resistance (open circuit) on a meter.

I'm not there to verify if your meter is working and you're using it right (sounds like you are) but if what you say is true and the meter is okay YES THE COIL IS BAD/OPEN.

Does that answer your question?

John T