1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 210Get this manual

1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 210

IGNITION SYSTEM DESCRIPTION This section is divided into 0) breaker point ignitIOn, (2) "60", "80" and "90" ignition system
the ignition systemit is of extreme importance that the following precautions be observedas high voltage is presentDO NOT
touch or disconnect any ignilion ystem parts while engine is runningkey switch is un, or while battery cables are connec
tedFailure to comply with the followin may result in damage to the ignilion system 1Do not reverse battery cable connections
at the batterySystem is negative (-) ground2Do not "spark" battery terminals with battery cable connectors to check polarity3Do
not disconnect battery cables while engine is running4Use only test equipment as specifiedSystem cannot be checked with conventional