C.E. Niehoff & Co. N1387 User Manual

Table 1 – Vehicle Operating Instructions

CAUTION

Do not press battery-connect button on vehicle when START-RUN
switch is in RUN position.

Normal Start-Up

1. Press vehicle battery-connect button to connect batteries.

2. Turn START-RUN switch to RUN position.

3. Wait until glow plug light goes off.

4. Turn START-RUN switch to START position and crank engine.

5. Return switch to RUN position when engine starts.

6. If engine fails to crank, turn START-RUN switch to OFF position, repeat steps 1-5.

7. If engine still fails to start, the EPM could be damaged.

WARNING

a. Remove cables from “Load” side of EPM and temporarily attach to “Battery” side

of EPM.

b. Follow steps 2-5 above.

Do not leave vehicle cabling connected as described in steps 7a-b.
Diagnostic and repair must be performed as soon as possible.

Emergency Start-Up

WARNING

1. Connect slave vehicle Nato connector to vehicle.

2. Follow steps 2-5 above.

3. Disconnect slave NATO connector after engine is running.

This procedure will bypass EPM and batteries in system. Use this
procedure ONLY when vehicle must be removed immediately from
location in an EMERGENCY.

Shutdown Procedure

1. Place gear shift in park or neutral and set parking brake.

2. Turn START-RUN switch to OFF position to stop engine.

3. Batteries will be disconnected from vehicle in 3 minutes
unless emergency flashers are on, then batteries will stay
connected until flashers are turned off or battery is
discharged.

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TABLE 2 – N3225 Regulator LEDs Diagnostics

N3225 LEDs COLOR N3225 STATUS

Off (Clear)

Flashing AMBER

(either 28 V or 14 V)

AMBER

(either 28 V or 14 V
with the other LED

off)

GREEN
(both flashing once
every 5 sec.)

AMBER

Steady

GREEN

Regulator is not energized. Measure IGN terminal voltage.
If voltage is above 21 V, regulator is defective.

Respective system voltage is reading high voltage.

Alternator is shut down and is not producing power for either
voltage. 28 V side trips after 2 seconds of reading voltage
above 32 V. 14 V side trips after 2 seconds of reading voltage
above 16 V. Regulator remains in this mode until reset by
restarting engine or if system voltage drops below 22 V or 11
V, respectively. See Chart 3 on page 9 of Troubleshooting
Guide for 28V systems, Chart 4 for 14 V systems.

Regulator is energized, but waiting for AC signal from
alternator.

Respective system voltage is below regulated setting or is
processing soft start (20-second delay).

Normal operation (respective system voltage is at regulated
setting)

TABLE 3 – EPM LED Diagnostics

EPM LED COLOR

EPM is not energized or EPM is defective.Off (Clear)

EPM STATUS

Flashing GREEN

Steady

GREEN

EPM has connected the batteries during start-up and has
prevented automatic disconnection for 3 minutes after vehicle
shuts down when only vehicle battery-connect button is
pressed.

Normal operation (batteries are connected to the system and
engine is running)

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