Mercury Mariner 4, 5 102CC Sail 1990 Outboard Service Shop Manual, Page 19Get this manual
5With eng ine inForwa rd" gearfu lly adva nce throttl to .O .T position Use timing li ght and chec hat 30 .T .D .Ct imi ng mark (a) of fl ywheelis alig ned with crankcase cover cyli nder block split line (b) Capacitor Charging Coil
ACAUTION
DO NOT rotate flywheel during test or damage to meier may result1Use an ohmm eter to pe rfor the followi ng test
Test Procedures
IMPORTANT: When using an ohmmeter 'or any resistance test, always zero meter movement whenever scales are changedIMPORTANT: If engine misfires, runs rough or does not start, the ignition system should be checked with volt meter capable of measuring 400 voe or higher and direct voltage adaptor (91-89045) or multi-meter OVA tester (91-99750)Follow Instructions in test manual Included with OVA or multi-meter OVA tester,
2If meter read ings are other han specifiedrep lace capacitor chargi ng coilRefer to "Ig nit ion Com ponen ts Removal and In stallation," fo llowing