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HT lead Earth Test lamp

You can make a rough check on coil voltage with a test lamp. Wedge the points open, clamp the lamp lead to the coil CB terminal and earth the probe. Turn on the ignition. If the lamp is bright, voltage is good; if it is dim or fails to light, there is a fault.


Checking the low-tension circuit

The low-tension (LT), or primary-ignition, circuit consists of the battery, ignition switch, cont...