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A typical ignition system

A typical ignition system Check that the leads are securely connected, and clean the insulation with a soft cloth. Plug gap Distributor cap Clean the tip of the roto arm by rubbing gently with a fine file or emery paper. Plug lead The ballast resistor - it may be fixed to the coil mountings or separately. Coil LT lead to switch LT connection HT lead from coil Spring clip The vacuum-advance tube may be a metal pipe with a screwed union, but a push-on sleeve like this is more usual and newer cars have plastic tubing. The HT leads may be connected to the distributor by push-in connectors covered by rubber seals; by a screw- in sleeve; or they may be inserted from the side and fixed by screws. The most usual type of coil, with the HT connection at one end in the centre and LT connections on either side. The HT connector may be a push-in type with a rubber seal or have a screw-in sleeve, while the LT connectors are usually spade type, but sometimes screws are used.
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