Voltage Testing; Start Circuit; Electric Starter Operation - BRP Evinrude E-Tec Series Service Manual

SYSTEM ANALYSIS

START CIRCUIT

Voltage Testing

Use the engine Monitor screen of the Evinrude
Diagnostics Software program or a digital multim-
eter to check voltages. Identify all wiring and cir-
cuits prior to performing any voltage tests. Refer
to Wiring Diagrams and descriptions of the vari-
ous systems for specific information on each cir-
cuit.
Identify erratic or lower than expected voltage
readings. Determine if the voltage source or the
wiring and connections of the circuit are the prob-
lem.
Use a digital multimeter to per-
IMPORTANT:
form voltage checks on external circuits only when
necessary. All EMM output currents are DC cur-
rent.
Battery Circuits (12 V)
Battery and auxiliary battery voltage is displayed
on the engine Monitor screen of the diagnostic
software. Each of these circuits are supplied
approximately 25 A of battery charging current as
needed and voltage is limited to approximately
14.5 V when outboard is running.
System Circuits (55 V)
55 V circuits are supplied 30 V when the key
switch is ON, the EMM is powered up, and the
outboard is not running and 55 V when outboard
is running.
Stator output supplies the rectifier circuits of EMM
with approximately 40 VAC when outboard is
cranking and approximately 55 VAC when out-
board is running.
Ignition System Circuits
Ignition voltage displayed on the engine Monitor
screen of the diagnostic software will have
approximately 125 ± 10 V when the key switch is
ON, the EMM is powered up, and the outboard is
not running and 200 ± 10 V when outboard is run-
ning. Cranking voltage is approximately 200 V.
122
START CIRCUIT
The start circuit provides the required current to
the starter motor and associated electrical circuits.

Electric Starter Operation

The starter must engage and turn the flywheel. A
cranking speed of approximately 100 RPM must
be achieved for the outboard to start. Normal
cranking speed is approximately 175 RPM.
Optimum starter performance is achieved by pro-
viding:
Proper battery capacity
•
TECHNICAL DATA on p. 18 for battery recom-
mendations
Cables capable of transferring the amperage
•
Low resistance battery and cable connections
•
A solenoid capable of switching the current
•
These "high amperage" start circuit components
provide the battery current required to crank and
start the outboard (electric start models). Check
the quality and condition of the following:
12 V Marine Battery
Battery type, capacity, and condition
•
Condition of battery posts, terminals, and con-
•
nections
Battery switch type, capacity, and connections
•
1
2
1. Main battery cable
2. Star washer
3. Battery post
Refer to Battery Installation on p. 36 for battery,
terminal, and cable requirements.
(675CCA). Refer
3
DR6495