Simplicity Broadmotor Series User Manual

7 Electrical System Service
Common Circuit Tests
7 - 14
SOLENOID
B
S
87 65
12 34
N.O.
SEAT SWITCH
(OCCUPIED)
BATTERY
CIRCUIT
BREAKER
PTO SWITCH
(OFF POSITION)
N.O.
N.O. or N.C.
N.C .
PEDAL SWITCH
(w/ PEDAL DOWN)
N.O.
KEY SWITCH
(RUN POSITION)
A
M
L
G
B
S
"D" SPLICE
ALTERNATOR
MAGNETO
A
E
F
G
J
L
K
H
I
B
C
D
Figure 9. Safety Shutdown Circuit Linear Diagram
Safety Shut Down Test
Perform the following tests if the engine will not run with
the key switch in the run position, or if the safety kill sys-
tem is malfunctioning.
NOTE: The logic of the interlock module allows the same
switches used for the cranking circuit to serve the safety
circuit as well. Therefore, if the engine turns over, it is
likely that the module is faulty or a wire is broken.
The procedure below uses a VOM to show voltage at
specific switches. If a switch is not transmitting voltage
across itself, it is defective and should be replaced.
Test Instrument: VOM set to VDC.
Control positions:
Brake Pedal - Depressed (parking brake set)
PTO Switch - OFF
Seat - Occupied
Ignition Switch - Start Position/Run Position
Battery: Both terminals connected.
Safety: Disconnect the lead from starter to prevent acci-
dental cranking. Secure away from the frame.
Procedure:
NOTE: Do not disconnect any of the switches or compo-
nents being tested unless instruction to do so. Probe
connectors from the back, or partially remove the con-
necter to probe the component terminals.
SAFETY SWITCH TESTS
1. Disconnect the lead from the starter motor and
secure away from the frame.
2. Connect the negative terminal of the VOM to the neg-
ative battery terminal.
3. Set the controls in the positions listed above.
4. Probe both sides of the circuit breaker (A, Figure 9 &
10). There should be current at both terminals.
5. Probe the L and S terminals of the key switch con-
nector (B, C). There should be current at both termi-
nals.
6. Check for current at both of the small terminals of the
solenoid (D).
7. Check for current at the foot pedal switch (E).
8. Check for current at the normally closed terminals of
the PTO switch (F).
9. Check for current at both seat switch terminals.
10. Check for current at the #7 terminal of the interlock
module (J). The #7 terminal must receive power for
the module to activate.
11. Check for current at the #3 (H) terminal of the inter-
lock module. A lack of current here means that the
wire connecting the #3 terminal and the seat switch is
broken.
12. Check for current at the #4 terminal. If current is pre-
sent, the #4 grounding wire is defective. If no current
is present replace the module.
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Simplicity Broadmotor Series Specifications

General

Brand	Simplicity
Model	Broadmotor Series
Category	Tractor
Language	English