WmInce Posted March 22, 2014 Report Share Posted March 22, 2014 The quiescent draw of the alternothingamajiggy is practically zero and the cap will eat any load dump spikes from starting or stopping IF the leads are not broken (which they often are). The reason for the switch is to cut out the Reg/rect if the thing goes open loop and tries to overcharge the battery (rare) or internally shorts which could drain the battery into the RR (not so rare). Curt, I sent you a private message. Link to comment Share on other sites More sharing options...
FastEddieB Posted March 22, 2014 Report Share Posted March 22, 2014 Andy, I assume you have the ROTAX 912 Owner's Handbook? From there: 9.4) Electric system See fig. 7. The ROTAX 912 engine is equipped with a dual ignition unit of a breaker- less, capacitor discharge design, with an integrated generator. The ignition unit is completely free of maintenance and needs no external power supply. Two independent charging coils (1) located on the generator stator supply one ignition circuit each. The energy is stored in capacitors of the electronic modules (2). At the moment of ignition 2 each of the 4 external trigger coils (3) actuate the discharge of the capacitors via the primary circuit of the dual ignition coils (4). Firing order: 1-4-2-3. Link to comment Share on other sites More sharing options...
Jacques Posted March 22, 2014 Report Share Posted March 22, 2014 QED Link to comment Share on other sites More sharing options...
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