Check Single Terminal Rotary Key Switch; Check Multiple Terminal Rotary Key Switch - Anti-Afterfire Circuit; Check Multiple Terminal Rotary Key Switch - Stop Switch Circuit - Briggs & Stratton Twin Cylinder L-Head Repair Manual

Check Single Terminal Rotary Key Switch

1. Disconnect stop switch wire from spade terminal.
2. Connect one meter lead to spade terminal and
other lead to switch mounting surface or a good
ground.
3. With key in "OFF" position. There should be conti-
nuity.
4. Move key to "ON" position. There should be no
continuity, Fig. 35.
Check Multiple Terminal Rotary Key Switch –
Anti-Afterfire Circuit
1. Disconnect equipment wiring harness from rotary
key switch.
2. Connect one meter lead to battery terminal (B) and
other lead to carburetor solenoid terminal, (L or S).
3. With key in "OFF" position there should be no
continuity, Fig. 36.
4. With key in "RUN" and "START" position there
should be continuity.
Check Multiple Terminal Rotary Key Switch –
Stop Switch Circuit
1. Connect one meter lead to stop switch terminal
(M) and other lead to a good ground. If key switch
is mounted to an insulated panel, use ground
terminal (G), Fig. 37.
2. With key in "OFF" position there should be conti-
nuity.
3. With key in "RUN" and "START" position there
should be no continuity, Fig. 37.
NOTE: Ground terminal (G) is grounded to
switch case. If meter indicates continuity
when key is in "RUN" and "START" posi-
tion, switch is defective.
2
OFF
Fig. 36 – Checking Anti-Afterfire Solenoid Circuit
M
Fig. 37 – Checking Stop Switch Circuit
SPADE
TERMINAL
Fig. 35 – Check Rotary Stop Switch
START
S OR L
B
OFF
ON
OFF
START
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