(The ballast resistor) permits the use of 6 volt coils in an otherwise 12 volt system. The two coils are wired in parallel with the resistor in series. When the battery voltage has dropped due to heavy current taken such as by the use of an electric starter, the ignition coils are fed direct, bypassing the resistor thus enabling the coils to work at their approximate potential (voltage).
pierodn wrote: I found on Commandos some Lucas coils both by 6V and other both by 12V.
My knowledge is that the electrical Commando system is 12V has the 6V coils placed in series (+-+-), while those from 12 V must could be put in parallel (++--).
It is so or 12V coils should not be used?.
pierodn wrote:The electronic injection (Boyer/Pazon) can be used with both coils from 6V or 12V too?.
I have some confusion because I'm studying now the electrical wiring system of the BSA 1969 Rocket 3 and I understand that it has 3 x 12V coils in parallel (right?) but if you want to fit the electronic injection must replace them with 3 x 6V (in parallel = 6V!!!!) or (3 x 4V in series = 12V).
dave M wrote:I must admit I don't know why this was done, although it is common practice in automobiles to run a 6v or 9v coil with a ballast resistor which is bypassed while the starter circuit is engaged.
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