1985 Ski-Doo snowmobile Service Manual, Page 356Get this manual
Section 04 ELECTRICAL Sub-Section 04 (BATTERY)
INSTALLATION OF BATTERY
Install battery, connect positive cable (red) then negative cable (black)Coat battery posts with petroleum jelly then slide protective cap over positive postConnect one end of vent tube to battery vent elbow and insert the other end in bottom pan hole
CAUTION: Ensure that neither the positive or the negative cables touch the muffler
TROUBLE SHOOTING:
Symptom
Discharged or weak battery