Service Manual
Relay
Switching
Relay
(energized)
Switching
Relay
(not energized)
Part Number
11 6397
Purpose
Uses current in one circuit to flip a NO (normally open) or NC (normally
closed) switch in another independent circuit.
How
It
Works
A relay is actually two simpler parts working together:
1.
Coil:
Terminals 85 and 86 are connected to a coil. Applying 12 volts to
these terminals energizes the coil turning it into an electromagnet.
2.
SPDT Switch:
Terminals
30,
87a and 87 are all actually part of a single
pole, double throw switch. Terminal
30
is the common lead. The
switch
is
spring loaded
so
that 30 and 87a are closed when the coil is
not energized. When the coil is energized, the switch is “thrown”, and
30 and 87 are connected. For a simpler explanation, see below:
Terminals Terminals
Coil
30
+
87
30
+
87a
Not Energized
Open
Energized
Closed Open
-___-
Closed
Testing
1. Disconnect the relay from the circuit.
2.
Verify the “not energized” conditions above with a volt/ohmmeter.
3.
Apply
12
volts to terminals 85 and 86 to energize coil.
4.
Verify the “energized” conditions above with
a
volt/ohmmeter.
Switch,
Ignition
Ignition Switch
(shown in run position)
Ignition
Switch
(shown
in start position)
Part
Number
116338
Purpose
Provides switching for starting and running.
How
It
Works
Contacts inside connect various terminals depending on the position of
the key. The conditions are as follows:
Position
Connections
Off:
None
Run:
B+L
Start:
B+L+S
Testing
1. Disconnect the switch from the circuit.
2. Use a VOM to verify the above connections.
3. If you are experiencing intermittent problems, be sure to wiggle the
key during testing.