1982 Ski-Doo Shop Manual, Page 277Get this manual
SECTION 04 ELECTRICAL SUB-SECTION 04 (BATTERY)
BATTERY CHARGING EQUIPMENT
The battery charger must have an adjustable charging rate Variable adjustment is preferredbut unit which can be adjusted in small increments is acceptable The battery charger must be equipped with an ammeter capable of accurately measuring current of less than one ampere If your present charger is not adjustable to the proper current valuesrheostat can be connected in series with the battery to provide adjustment12 Ohm, 50 watt rheostats, such as OHMITE0314 or MALLORY 50K 12P, are available from electronic parts supply shops and they are suitable for use with most chargers if the peak current is held below ampsIf you need an accurate ammeter, we recommend the use of: SHURITE5202 (0 to amps) or5203 (0 to amps) available from electronic parts supply shops+