Lotus Elan

Earthing the ignition coil - or not

PostPost by: RichardS » Tue Jul 14, 2009 8:39 pm

I am in the process of replacing a Lucas Sport coil with ballast resistor for a Bosch Blue Line coil - I no longer need the ballasted system.

Looking back through the archives there have been previous debates on earthing the coil case.

The Lucas coil body was eartheda nd on checking with a multimeter the metal body is in circuit with the terminals.

However on the Bosch coil [which has a metal body too] there is no connectivity between the terminals and the body so I cannot see the need to earth the body. As described in an old previous post from Rohan elan-f15/coil-and-distributor-wiring-t1502.html I figure the HT circuit earths through the LT circuit and does not involve the metal body.

Is my reasoning sound?

Richard
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PostPost by: neilsjuke » Wed Jul 15, 2009 7:34 am

Best to earth it if the coil was to have a insulation fault the body would then be live and a spark to your hand or some petrol related earth point would not be welcome. You will need to earth if fitting a 1mF cap for radio suppression .
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PostPost by: RichardS » Wed Jul 15, 2009 8:10 pm

Thanks Neil - sounds sensible.

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