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TR7 V8 Location of coil ballast resistor wire


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Anybody know where this wire is actually routed, the coil end seems obvious, but the wiring diagram shows it going all over the place.

I need to bypass it to allow use of a 12volt Mallory coil.

I suppose I could just pick up a 12 volt ignition switched supply from perhaps the unused rear window heater supply as it's a convertible, but I'd prefer to keep it nearer to the original route if possible.

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  • 3 weeks later...
On 5/8/2021 at 4:14 PM, Droptop said:

Anybody know where this wire is actually routed, the coil end seems obvious, but the wiring diagram shows it going all over the place.

I need to bypass it to allow use of a 12volt Mallory coil.

I suppose I could just pick up a 12 volt ignition switched supply from perhaps the unused rear window heater supply as it's a convertible, but I'd prefer to keep it nearer to the original route if possible.

The wire is a apparently special kind called Eureka wire and forms part of the loom so the easiest option will be to fix up a new 12v feed direct, that is what I have done for the electronic ignition on my cars.

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I can’t recall the wrapped brown wire but when I converted mine to V8 with a S & S kit, I added a SD1 ballast resistor close to the relocated coil behind the L/H headlight as per their wiring diagram.

I recently replaced it with a Lumenition coil and Ballast Resistor when the original TR7 coil failed after 35 years.

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