Disconnect the existing primary wiring from each coil.
Set your MM to most sensitive scale.
Measure Ohms.
Should be equal.
Slick
Did that. Nothing. Coils are 50 years old.Are you testing them because there is no spark at the plugs if you remove the plugs, lay them on the head where the plug screws in, reconnect the lead, turn on the ignition and kick the start lever?
That should be your first test - to see if there IS spark. If there is a blue-white spark, no reason to further test the coils
It still might be something other than coils. My '74 original lucas coils still fine. You could have an issue with the points or condenser or ign power or grounding.Did that. Nothing. Coils are 50 years old.
OK . FYI try Google up how to use and read a muti meter.And what is primary wiring? I’m a novice.
If you have OEM Lucas coils they are marked on the bottom Either 17M 6 for 6 volt coils used on late bikes with a ballast resistor. or 17M12 for 12 volt coils used on early ( Pre 1972 bikes)I have a multimeter. Want to test my coils. Advice?
Primary wiring is the power supply to both coil negative terminals (for positive earth/ground) from the master switch, which on your '1970' model is normally white (see diagram below).And what is primary wiring? I’m a novice.
Thanks to Greg, issue resolved. I installed points incorrectly and they were grounding out.I have a multimeter. Want to test my coils. Advice?