Jump to content


Converting From Ballast Ignition To Std 12V Ignition

  • Please log in to reply
1 reply to this topic

#1 KernowCooper



  • Mini Docs
  • PipPipPipPipPipPipPipPipPipPip
  • 7,842 posts
  • Name: Dave
  • Location: The South West
  • Local Club: Kernow Mini Club

Posted 26 July 2013 - 10:23 PM

After approx 1982-84 Minis used a system where by they used a 9v coil which was fed from a ballast resister in the wiring loom and a feed from the starter solenoid when starting the 9v coil was fed 12v for better starting.


This system is renowned for the balast resister which feeds the White/Pink wire to the coil + of overheating and the ballast resister burning the wiring loom out in the engine bay and usually approx 6-8inches from the fusebox on the right of the car.


If you have a ballasted system on your car I strongly advise you to convert it to standard 12v system.


Parts you will need are


New 12v 3.5ohmn coil available from Minispares GCL 216 or sports MSC105 or the Lucas Sports Coil DLB 105

Cable and connectors for a new 12v feed


Fuse one is the normal switched supply from the coil, make a new white feed wire ( SWG 12/14) and connect to fuse one where the original white fed the resister white/pink


Tape the new feed into the loom or attach external and run to the new 12v coil you've fitted, connect up the - coil terminal as before, discard the White/Pink & White/Yellow previously connected to the old coils + terminal and connect the new white 12v feed to your new coils +


Your now running a standard 12v Ignition System and wont have a nasty surprises with smoke pouring out the engine loom and half a days rewiring.


If You Have A Ballast Ignition This Is One Modification You Need To Do

#2 Ethel


    ..is NOT a girl!

  • TMF Team
  • PipPipPipPipPipPipPipPipPipPipPip
  • 23,783 posts
  • Local Club: none

Posted 26 July 2013 - 11:16 PM

Is it worth pointing out that the resistor is the pink/white wire, there's no extra component.


My experience is that the system works well - as long as it hasn't been abused with dead shorts, incorrect coils etc. You can measure the resistance of the pink/white wire to check it's still in within spec - around 1.5ohms.


Some good ignition info - by a familiar name to TMF  :-)

1 user(s) are reading this topic

0 members, 1 guests, 0 anonymous users

Mini Spares