Jon Nield

Thanks all. Finally got it sorted. Ballast resistor now bypassed and root cause problem tracked down to a deteriorating HT lead. All leads now renewed and engine running sweetly (at last). Regards, Jon

My 1971 GT6 Mk III has recently started to mis-fire whilst motoring, but only after running fine for the first 15-20 minutes, so I'm guessing this is a problem with the HT coil and related to heat build up, based on my reading of the various articles on this subject on the forum. It's currently fitted with a Lucas DLB 105 and a ceramic ballast resistor. According to Rimmer Bros info, DLB 105 (part no. GCL110HP) is a high performance 12v coil for Mk I & II - presumably this is a 3 ohm coil and should not be used in combination with the ballast resistor. On the basis that I stick with ballast resistor, is the correct coil one of the following: a) Ignition Coil - Standard - 6v ballasted (GCL132) Ignition Coil - High Performance - 6v ballasted (GCL132HP) and, if so, am I better off with the HP version?