APRILIA RS 50 Workshop Manual page 104

Electrical system
CHECK DATA
CHECKING THE STARTER RELAY
Disconnect all the wires from the relay.
Using a multimeter with the scale set to ohms, test the
continuity between terminals 30 and 87.
Exact value: infinity.
Apply voltage to terminals 85 and 86 with a 12 V
battery. Using a tester in ohmmeter mode, test the
continuity between terminals 30 and 87.
Exact value: 0 Ω.
Positive
key-controlled
5) Battery
6) Starter relay
16) Starter button
34) Starter motor
CHECKING THE STARTER BUTTON
Check the starter motor input current with a 0 ± 100 A
a.c. ammeter, after removing the spark plug cap, so
that the engine won't start.
Normal values: 25 A starting, 20 A at running speed ±
15 %.
Using a multimeter with the scale set to ohms, check
the resistance between the positive and negative
terminals of the starter motor.
Normal value: 0.5 Ω ± 10 %.
CHECKING THE STARTER BUTTON " "
Disconnect the button connector.
Using a tester in ohmmeter mode check the continuity
between the contacts in the pressed and rest posi-
tions by testing the connections (MAIN WIRING
DIAGRAM).
ch. 6
16
V/R
B
R
+ -
5
G/R
85
87
30
R
86
6
B
Release 00 2001-03
RS 50
34
M
6-11
6