Specifications

21
appear to be identical, there are internal differences to keyswitches. Therefore it is necessary to have
a diagram of the keyswitch showing the terminal positions and their functions. For example, see the
5 terminal switch diagrams in Figure 1 and Figure 2. The keyswitch in Figure 1 is compatible with all Briggs &
Stratton alternators. Note in Figure 2, that when the “brand X” keyswitch is in the START position there is no
battery voltage available to the #2 switch terminal. Consequently, if the replacement Briggs & Stratton engine
was equipped with a carburetor solenoid, it would not function. This is why it is important to have a diagram
of the keyswitch when replacing engines, or replace the keyswitch with one that is compatible with all Briggs
& Stratton alternator systems.
It is not possible to show all of the wiring diagrams or keyswitch combinations that are used by equipment
manufacturers. However, the following wiring diagrams for the most popular Briggs & Stratton engines may be
used as a guide when replacing an engine. The wiring diagrams show the type of keyswitch that is compatible
with the alternator system shown.
6
5
4
32
1
L
M
G
A
A
1-6-3 2-5-6 2-4-5
S
6
5
4
32
1
L
M
G
A
A
S
6
5
4
32
1
L
M
G
A
A
S
OFF
RUN
START
Figure 8
Part# 692318
TERMINAL
NO.
FUNCTION
1 Ground (Used only with insulated panel)
2 To Carburetor Solenoid
3 To Stop Switch Terminal On Engine
4 To Solenoid (Tab terminal)
5 To Battery (Battery terminal on solenoid)
6 To Alternator (DC Output)
NOTE: The 5 terminal Briggs & Stratton keyswitch, part number 490066, shown in Figure 1 has been
replaced by a 6 terminal keyswitch, part number 692318. The additional terminal provides a direct
connection for the charging lead at the keyswitch.
This is a "Truth Table"
5
3
2
1
M
G
L
S
B
5
3
2
1
M
G
L
S
B
5
3
2
1
M
G
L
S
B
4
4
4
BRIGGS & STRATTON KEY
SWITCH 5 TERMINAL POSITIONS
TERMINAL
NO.
FUNCTION
1-G Ground (Used only with insulated panel)
2-L To Carburetor Solenoid
3-M To Stop Switch Terminal On Engine
4-S To Solenoid (Tab terminal)
5-B To Battery (Battery terminal on solenoid)
OFF
RUN
START
Figure 6
Part# 490066
OFF
RUN
START
BRAND X KEY SWITCH 5 TERMINAL POSITIONS
TERMINAL
NO.
FUNCTION
1-A Accessory
2-M To Stop Switch Terminal On Engine (Ground)
3-R To Regulator (Charging)
4-S To Solenoid (Tab terminal)
5-B To Battery (Battery terminal on solenoid)
Figure 7
5
3
2
1
M
A
R
S
B
5
3
2
1
M
A
R
S
B
5
3
2
1
M
A
R
S
B
4 4
4