I have recently acquired two old half dead 15hp motors and want to revive at least one of them. Trouble shooting on my blue one (AE15BACDE) I think the powerpack is knackered. No sparks and both coils and the stator seem OK - resistance check etc as per manual. So, I go over to my white one (J15BAEIA) and guess what - no powerpack. However, only 4 wires come out from under the flywheel: 2 orange ones go straight to the coils, the other two to the kill switch (There are also three yellows for ac power that end in dead ends - not used). In my manual there are no wiring diagrams for models like this. What's more, the flywheel nut won't budge so I can't take a look. Is the powerpack under the flywheel on my white one? At first check, no sparks on hte white one either.