Jolanda, the wiring diagram for a 100 was discussed some time ago. Sorry I can't provide one but there are at least a couple members who were able to e-mail a copy to other members. Hope they see your post.
In the mean time, I believe the "G" position on the magneto equipped Briggs engine switch should show continuity to the switch base. So the base needs a good clean ground to the tractor frame and neg. battery terminal.
Memory is a bit fuzzy on this, but do you recall a Yellow, Black, or White wire that was connected to a spade on the magneto and going somewhere to the outside of the flywheel cover? That would be the one that needs to connect to the "G" part of the key switch to "ground " the mag. to stop the engine. It might be in a multiple wire plastic connector with the wires from the stator. The wire may have been attached directly to the points to do the same thing.
Hope you get the wiring diagram to save for the future.
tommyhawk
In the mean time, I believe the "G" position on the magneto equipped Briggs engine switch should show continuity to the switch base. So the base needs a good clean ground to the tractor frame and neg. battery terminal.
Memory is a bit fuzzy on this, but do you recall a Yellow, Black, or White wire that was connected to a spade on the magneto and going somewhere to the outside of the flywheel cover? That would be the one that needs to connect to the "G" part of the key switch to "ground " the mag. to stop the engine. It might be in a multiple wire plastic connector with the wires from the stator. The wire may have been attached directly to the points to do the same thing.
Hope you get the wiring diagram to save for the future.
tommyhawk