TM 5-3805-258-24-1
9 5 0 B O P E R A T O R ’ S S T A T I O N
E L E C T R I C A L T R O U B L E S H O O T I N G
DIODE ASSEMBLY CIRCUIT DESCRIPTION
The diode assemblies are in rubber packages similar to the rubber plugs on the
harnesses. They connect directly to a harness plug.
CAUTION
The 1V9633 and 2V9473 Diode Assemblies can be damaged if they are
not removed carefully. The rubber packages are soft and the diodes
can be broken if the diode assembly is removed with pliers.
A. 2VS472 DIODE ASSEMBLY (BLACK)
I
t
I
WIRE COLORS
i
DIODE
LOCATION
IDENTIFICATION
CIRCUIT
FUNCTION
ANODE
CATHODE
A
Key switch to coil of
Isolate the engine stop relay
PIBR
RIW
stop relay
when engine is operating
B
Across coil of main
Free wheeling diode protects
B
RIW
power relay
key switch
On Relay panel
c
Key switch to coil of
Prevents relay from activation
RIW
RIW
main power relay
if batteries connected back-
wards
D
Alternator “R” terminal
Keeps relay activated if key
to main power relay coil
switch is turned off with engine
DKGR
R/W
running
2 V 9 4 7 3 D i o d e A s s e m b ly
4-139
