1974 Johnson 40 HP Outboard Motors Service manual, Page 31Get this manual
The second magnet, 180 away and of opposite pola ity, passes the driver coilinducing curren flow fr om the dr iver coil through points #1 (closed) across the armature plate up through points (closed) and then to the other side of the driver coilThe cam now opens points 2, and the voltage rises rapidly across the primary oC ignition coil 11 2The con denser in the primary absorbs the current which would otherwi se arc across the opening points (112) The ignition coil steps up the voltage and fires cylin der 112 MAG NET I
Each Ignition coil actually consists of two coilsSee Figure 4- 7One, called the primary, consists of elatively few turns of heavy gage copper wire The other, called the secondary, consists oC many turns of fine gage wireThe coils are separated by insulation and mounted on the center leg of "0" shaped laminated iron core
MAGN ET POINT I
DR IVER COIL