Originally Posted by
Tony B. Yes, but there several hidden joints in a Mk1 loom !. There certainly is a black and yellow going from the solenoid which joins to the coil black and yellow and serves as a ballast bypass on cranking only. Note that to avoid 12v "feed back" the ignition feed to the coil is cut when the key is in the start position. The ballast wire in the loom is usually pink, (it's a long one) and starts just after the bulkhead plug and usually finishes where the other two black and yellow wires connect inside the loom somewhere in the vacinity of the coil.
If the unit is a Pertronix, it likes a 12v feed so you may be better off running a wire from an ignition live on the engine bay side of the fuse box to the red wire on the Pertronix, don't connect that to coil at all, only the black one.
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