1991 Johnson/Evinrude EI 60 thru 70 outboards Service Manual, Page 228Get this manual
it General Safety Warnings The motor cover is machinery guardUse caution when conducting electrical tests on running enginesDo not wear jewelry or loose clothingBefore working on or removing any electrical parts, disconnect the battery cables at battery to prevent electrical sparksBefore returning the outboard motor to the owner, make sure: all electrical connections are tight, insulator boots and sleeves are in place, and electrical wires are routed and clamped in the original positionDo not use jumper cables and booster battery to start engineDo not charge battery in the boat with an external chargerFumes vented during either operation can lead to an explosionReplace any locking fastener (locknut or patch screw) if its locking feature becomes weakDefinite resistance to tightening must be felt when reusing locking fastenerIf replacement is indicated, use only authorized replacement or equivalent