Posted by John T on February 09, 2010 at 05:08:05 from (71.55.31.109):
In Reply to: J4 Magneto posted by Coax on February 08, 2010 at 19:45:20:
If its a mag grounding kill switch they are connected to the points.
THEREFORE when points are CLOSED Id expect:
Near 0 ohms (short) to case/frame/ground
when points are OPEN Id excpect
Very Low Ohms (0.25 to 1.5 ohms) to case/frame as thats the low voltage primary winding of the coil. (If open the coil is badddddddd)
AS BOB CORRECTLY NOTED BELOW
Id expect maybe 3000 to 10,000 ohms from the HV output to case/frame as thats the coils HV secondary winding. If its an open circuit its badddddddd
NOTE it takes a good ohm meter to read those real low ohms accurately as a cheap one may look like its zero ohms points open or closed. Use the R x 1 scale
MAKE SURE the grounding stud isnt shorted to ground nor the wire from it to the points
NOTE theres probably a condensor in paralell with the poonts connected to case/frame/ground. If its shorted out that kills the spark (and the ohms to case/frame will ALWAYS read zero points open or closed). If its totally bad/open she can still fire but a weak spark.
Stick a GOOD ohm meter on the low ohms R x 1 scale on the kill terminal and insure its NOT always a dead short and see if its near 0 ohms when points are CLOSED but 0.25 to 1.5 or so ohms when OPEN..........
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