GILLIG LOW FLOOR, Руководство по обслуживанию

Страница: 377 / 506

Electrical System
377
Starter Relay Circuit Test
A starter relay that does not close or drops out too soon can be caused by high resistance or an open cir-
cuit in the control circuit. Perform the starter relay circuit test as follows (Figure 9-18):
1. Disconnect the “S” lead
from the solenoid to prevent
the engine from cranking,
and wrap terminal with a rag
to keep from grounding.
2. With the ignition rotary
switch selected to IGNI-
TION, push the start button.
(If working from the engine
compartment, flip the IGNI -
TION switch to the ON po-
sition and push the ENGINE
START button on the Rear
Run Box.) You should hear
the starter relay close. If not,
proceed to next step.
3. Connect the voltmeter to
the battery cable ends at the
starter (voltmeter connection
1).
4. Push the start button and
measure the battery cable
voltage.
5. Connect the voltmeter to
the two small terminals of
the starter relay (voltmeter
connection 2). If only one
small terminal exists, use the
starter relay bracket for the
ground connection.
6. Push the start button and measure the starter relay voltage.
7. Determine control circuit loss by applying the following formula:
Battery positive (+) terminal to relay
to battery negative (–) termanl
Battery Cable Voltage – Starter Relay Voltage =
VOLTMETER
STARTER RELAY
START BUTTON
IGNITION SWITCH
BATTERY
+
20-800-85
BATTERY
+
BATTERY
+
S
2
1
Figure 9-18, Starter Relay Circuit Test