Bombardier SeaDoo 1990 factory shop manual, Page 120Get this manual
Sub-section 05
Section 07 ELECTRICAL (CDICHARGING SYSTEMS)
3 Perform test Push reset button and repeat test three times
RESUILTS
a) Indicator lamp lights Battery charging coil output is OK
bIndicator lamp does not light Battery charging coil is faulty Replace it
Resistance Measurement
As an allternate method, battery charging coil can be checked with an ohmrneterfpreferably digital one1