KKK-A-1822 E
NOTE:
DIESEL ENGINE MANUFACTURERS STATE THAT THEIR ENGINES
SHOULD BE SET AT AN ELEVATED SPEED DURING EXTENDED
IDLE PERIODS. ADDITIONALLY, THE ELEVATED IDLE SPEED
REDUCES TORSIONAL VIBRATION WHICH CAUSES ALTERNATOR
BELT SLIP PAGE.
3.7.6.2 AMMETER.
The electrical system (see Figure 5A or 5B) shall incorporate a center scale ammeter or
equivalent electronic digital display which is capable of indicating a current of +/- 150
amperes or greater to exceed the worst case ampere load. The ammeter shunt, Hall Effect,
or other current sensing device shall be electrically located in the electrical system to indicate
all the current going to (charging) or from (discharging) the vehicle's batteries. When
specified, furnished, (see 6.2) or when the chassis manufacturer disallows the cutting of
power leads, a "Hall Effect" or other similar current sensing device shall be furnished in
place of the ammeter shunt. The shunt or other current monitoring device shall not exceed
150 MV drop at maximum current. The ammeter and shunt, or equivalent device, shall
have a combined accuracy of +/- 10 percent of the full scale reading. The meter shall be
mounted in a location highly visible to the vehicle operator and shall be illuminated for
night operation. The shunt or monitoring device shall be protected against physical damage,
weather, road spray, and shall be mounted in an easily accessible location, and shall minimize
the length of the power cables.
3.7.6.3 VOLTMETER OR VOLTAGE MONITOR.
A voltmeter, or equivalent electronic device, illuminated for nighttime operation, which
constantly monitors the 12 volt electrical system or a warning device and indicates abnormally
high or low electrical system voltages, shall be furnished. The device furnished must be
mounted so it is clearly visible to the driver at all times.
3.7.7
BATTERY SYSTEM.
Two 12 volt batteries (or additional batteries as required by the chassis manufacturer) for
ambulance use shall be furnished. When installed by the chassis manufacturer, a labeled
"Battery Disconnect Switch" (or a switch operated solenoid) shall be furnished per Figure
5A. All electrical loads added by the ambulance manufacturer shall be controlled by an
illuminated "Module Disconnect" switch or an illuminated, switch controlled, solenoid as
shown in Figure 5A or 5B. Unless otherwise specified (see 3.15.3-5), the batteries shall be
equivalent to the chassis OEM batteries. When high cycle batteries are specified (Delco /
Delphi 1150 or 1151, or equal), ratings for each battery shall not be less than 700 cold
cranking amps, and 180 minutes reserve capacity.
Battery ratings shall conform to SAE J537. Batteries shall be located in a ventilated area,
sealed off from occupant compartments, and shall be readily accessible for servicing and
removal. When batteries are mounted in the engine compartment, they shall be provided with a
heat shield as a safeguard against high under hood temperatures.
If the chassis manufacturer furnishes and installs the "Battery Disconnect Switch"(Fig.5A),
it shall be clearly visible to the driver, in the seated position. If the switch is not visible, a
green indicator light, shall be furnished indicating the batteries are "ON" (see 3.7.1.1).
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