1990 Johnson Evinrude "ES" Electric Trollers Service Manual, P/N 507869, Page 41Get this manual
Resistor AssemblyAll Models
perform this check after completing Motor Tube Wiring checks
To avoid damaging components or troubleshooting equipment, disconnect the battery cables before proceeding1Turn the speed control switch to the "OFF" position
2Remove the motor from the adapter housing Do not disconnect the motor leads at this time
3Use an ohmmeter calibrated on low ohms scale to test the condition of resistor