1978 Johnson 55 HP Outboards Service Manual, Page 49Get this manual
METAL JUMPER (il ', !
Terminal "B" Terminal "C" Red meter lead Black meter lead Figure 4-28Power Pack Output Test
POWER PACK OUTPUT Set meter switches to negative and 500Disconnect three wire connector between power pack and ignition coilsInsert jumper leads between "B" terminals of connectors and between "C" terminalsSee Figure 4-28Connect meter black lead to engine groundConnect meter red lead to metal part of jumper lead coming from power pack cavity "B Crank engineObserve meter readingConnect meter red lead to metal part of jumper lead cavity "C Crank engineObserve meter readingaIf meter reads 180 or higher, check ignition coil or coilsbIf meter does not read 180 or higher on one output, remove jumper lead from that cavity of connector from power packInsert meter red lead into that cavityCrank engine: If meter reads 180 or higher, ignition coil is defectiveIf meter does not read 180 or higher, power pack is defectivecIf meter does not read on both outputs, power pack is defective