A method of controlling an ignition system, said ignition system including a spark plug control unit adapted to control at least two coil stages so as to successively energise and de-energise said coil stage(s) to provide a current to a spark plug, including two stages comprising a first transformer including a first primary winding inductively coupled to a first secondary winding; a second transformer including a second primary winding inductively coupled to a second secondary winding; said control unit enabled to simultaneously energize and deenergize primary windings (L1, L3) by simultaneously switching on and off two corresponding switches (Q1, Q2) to sequentially energize and de-energize primary windings (L1, L3) by sequentially switching on and off both corresponding switches (Q1, Q2) to maintain a continuous ignition fire; said ignition system further including a step-down converter stage located between said control unit and coil stages, said step-down converter including a further switch and a diode, said control unit being enabled to switch off said further switch, characterized in that the method provides control to limit the secondary current peak at the end of a Coupled Multi-Charge period, comprising the steps of, at the end of the Coupled Multi-Charge period when the two corresponding switches (Q1, Q2) are simultaneously switched on: i) switching (step 2) off the further switch; ii) measuring (step 3) the primary current (Ip) and setting (step 3) a secondary current threshold (Isth) dependent on said measured primary current (Ip); iii) comparing (step 4) said secondary current threshold value (Isth) with a minimum value (Isthmin); (iv) if the secondary current threshold (Isth) is lower than the predetermined minimum value (Isthmin), switching the two corresponding switches (Q1, Q2) on and ending the method; v) if the secondary current threshold (Isth) is greater than or equal to the predetermined minimum value (Isthmin), executing the following steps: v-i) toggling (steps 6,7) said two corresponding switches (Q1, Q2), wherein the first corresponding switch is switched off and the second corresponding on or vice versa; v-ii) measuring the secondary current (Is) and comparing (step 9) this with the secondary current threshold (Isth), v-iii) waiting until it is determined that said secondary current (Is) is below the secondary current threshold (Isth) and repeating steps ii) to iii) and v) or performing steps ii) to iii) and iv). i) switching (step 2) off the further switch; ii) measuring (step 3) the primary current (Ip) and setting (step 3) a secondary current threshold (Isth) dependent on said measured primary current (Ip); iii) comparing (step 4) said secondary current threshold value (Isth) with a minimum value (Isthmin); (iv) if the secondary current threshold (Isth) is lower than the predetermined minimum value (Isthmin), switching the two corresponding switches (Q1, Q2) on and ending the method; v) if the secondary current threshold (Isth) is greater than or equal to the predetermined minimum value (Isthmin), executing the following steps: v-i) toggling (steps 6,7) said two corresponding switches (Q1, Q2), wherein the first corresponding switch is switched off and the second corresponding on or vice versa; v-ii) measuring the secondary current (Is) and comparing (step 9) this with the secondary current threshold (Isth), v-iii) waiting until it is determined that said secondary current (Is) is below the secondary current threshold (Isth) and repeating steps ii) to iii) and v) or performing steps ii) to iii) and iv). v-i) toggling (steps 6,7) said two corresponding switches (Q1, Q2), wherein the first corresponding switch is switched off and the second corresponding on or vice versa; v-ii) measuring the secondary current (Is) and comparing (step 9) this with the secondary current threshold (Isth), v-iii) waiting until it is determined that said secondary current (Is) is below the secondary current threshold (Isth) and repeating steps ii) to iii) and v) or performing steps ii) to iii) and iv).