1978 Ski-Doo Shop Manual, Page 328Get this manual
SECTION 05 SUB-SECTION 05 (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 battery overflow tube to outlet tube located on bottom plateCAUTION: Ensure that neither the positive or the negative cables touch the mufflerTROUBLE SHOOTING:
SYMPTOM
Discharged or weak battery
1Faulty rectifier