MadMack Posted April 9, 2017 Share Posted April 9, 2017 Hello all, Just putting our Mack NM back to 6V after the previous owners attempted conversion. Are there different ignition coils for different purposes I.E/ motorcycles or trucks? Or is it one size fits all? Any help gratefully revived Thanks Quote Link to comment Share on other sites More sharing options...
101 Ron Posted April 9, 2017 Share Posted April 9, 2017 (edited) The NM Mack should run a standard 6 volt coil. Being war time vehicle as much as possible was interchangeable with other US vehicles. 6 volt Jeep coil will work fine. That model Mack had 12 volt supplied to the coil and starter while cranking and then when the motor started running it went back to 6 volts. Two batteries used with a series / parallel switch for change over for starting. 12 volt though a 6 volt coil just while cranking the motor for a short time will not hurt it. Edited April 10, 2017 by 101 Ron Quote Link to comment Share on other sites More sharing options...
MadMack Posted April 12, 2017 Author Share Posted April 12, 2017 The NM Mack should run a standard 6 volt coil.Being war time vehicle as much as possible was interchangeable with other US vehicles. 6 volt Jeep coil will work fine. That model Mack had 12 volt supplied to the coil and starter while cranking and then when the motor started running it went back to 6 volts. Two batteries used with a series / parallel switch for change over for starting. 12 volt though a 6 volt coil just while cranking the motor for a short time will not hurt it. Thank you very much for your help! Quote Link to comment Share on other sites More sharing options...
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