1985 Ski-Doo snowmobile Service Manual, Page 368Get this manual
Section 04 ELECTRICAL Sub-section 06 (TESTING PROCEDURE)
4) Turn ignition key to ON position, disable emergency cut-out button circuit and tether cut-out switch and then crank enginea) Indicator lamp lights: Coil output is up to specificationsRepeat test at least three (3) times to verify reading and check for consistencyb) Indicator lamp does not light: Coil output is below specificationsThis could be caused by faulty coil or breaker pointsCheck breaker points condition and adjustment, and correct as necessaryRepeat testIf lamp still does not light the coil is defective and should be replaced
253,377,447,462,467,503,532,537, COl SYSTEMS VERIFICATION
1High speed charging coil
Disconnect wire connectors from C.D.Ielectronic box harness at engine
2) Connect tester test lead to blackwhite wire and connect tester test lead to blackred wire at the magneto harness(TYPICAL)
2Lighting coils output (247 engine type)
NOTE: There are two independent coils; main (large) coil wires are yellow and yellowblack while brake light coil (small) wires are green and greenblack1) Disconnect wiring harness junction block at engine2)