Originally Posted by
digger
As in for radio signal??
When the Series 1 came out in 1948, few would have even thought of using a radio in one, or indeed any other car. (In Australia, as an example, few cars had factory fitted radios until the 1960s) As radios in cars became more common, and as ignition interference to television became more noticeable (remember no TV in Australia until 1956, almost the end of Series 1!) it became common to do something about it.
The initial method of doing this was to fit a resistor in series with each plug lead, the resistor being in a moulded bakelite or plastic housing. This could be screwed to the plug connector as here, or part way along the lead. This was eventually superseded by the now universal practice of having resistive leads. It is most important not to use both. If you do, it is likely that there will be zero interference - because the engine will not start. At best you can expect a fussy engine that will only run with everything set exactly right.
You can expect problems finding non-resistive (metallic wire) high tension leads, but should be able to find them. (otherwise, don't use the the discrete resistors) If using resistive leads on these bakelite plug shrouds (and the screw connectors on the distributor) you need to take care that the termination makes good contact - they are designed for wire.
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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