C.E. Niehoff & Co. LBCD Static/Dynamic Troubleshooting Guides - Manual

TG53B Page 1 of 2
LBCD Static and Dynamic Tests
Testing Procedures
LBCD Static Tests
(Dynamic Tests on Page 2)
Before testing unit:
Remove all cables from top terminals and control har-
ness from side of unit.
TABLE 1 Pin-to-Pin Tests (See Figures 1 and 2)
METER (+) LEAD
CONNECTION EXPECTED READING
Diode Test
Diode Test
Diode Test
Diode Test
Diode Test
Diode Test
Ohms Ω
Ohms Ω
Ohms Ω
METER (–) LEAD
CONNECTION TESTED CIRCUIT
24 V LOAD terminal
24 V BATTERY terminal
12 V LOAD terminal
12 V BATTERY terminal
Socket A*
Socket B*
Socket A*
Socket A*
Socket A* 24 V BATTERY terminal
24 V LOAD terminal
12 V BATTERY terminal
12 V LOAD terminal
Socket B*
Socket A*
Socket C*
Socket D*
Socket E* 24 V battery circuit
24 V battery circuit
12 V battery circuit
12 V battery circuit
internal circuit
internal circuit
internal circuit
internal circuit
internal circuit OL (blocking)
.3-.7 V (flow)
OL (blocking)
.3-.7 V (flow)
.3-.7 V (flow)
OL (blocking)
>25 K ohms
300-350 ohms
>25 K ohms
Control harness
receptacle
12 V Battery

24 V Load

12 V Load

24 V Battery


Figure 1 – N2003 Load & Battery Control Device Figure 2 – N2003 Control Harness Receptacle
* Socket in LBCD control harness receptacle
Static tests may not diagnose all
LBCD failures. Dynamic testing
should also be performed. See
Page 2.
NOTICE
Pin Function
TABLE 2 – N2003 Harness Plug
Pin Functions
A
B
C
D
E
Battery Ground
Chg. System Indicator Ground Signal
Battery Disconnect Ground Signal
AC In from Regulator AC Terminal
Battery Voltage Sense/Trickle Charge
METER SCALE
& SYMBOL