Generac Portable Products MC4000 Generator
7
Operating Automatic Idle Control
This switch is designed to greatly improve fuel economy.
When this switch is turned ON, the engine will only
run at its normal high governed engine speed when an
electrical load is connected. When the load is removed,
the engine will run at a reduced speed. With the switch
OFF, the engine will run at the normal high engine speed.
Always have the switch off when starting and
stopping the engine.
Charging a Battery
WARNING! Storage batteries give off explosive
hydrogen gas while recharging. This explosive
mixture will remain around the battery for a long
time after it has been charged. The slightest spark
can ignite the hydrogen and cause an explosion. Such
an explosion can shatter the battery and cause
blindness or other serious injury.
WARNING! Do Not permit smoking, open
flame, sparks or any other source of heat around a
battery. Wear protective goggles, rubber apron and
rubber gloves when working around a battery.
Battery electrolyte fluid is an extremely caustic
sulfuric acid solution that can cause severe burns. If
spill occurs, flush area with clear water immediately.
Your generator has the capability of recharging a discharged
12 Volt automotive or utility style storage battery. Do Not
use the unit to charge any 6 Volt batteries. Do Not use
the unit to crank an engine having a discharged battery.
To recharge 12 Volt batteries, proceed as follows:
• Check fluid level in all battery cells. If necessary, add
ONLY distilled water to cover separators in battery
cells. Do Not use tap water.
• If the battery is equipped with vent caps, make sure they
are installed and are tight.
• If necessary, clean battery terminals.
• Connect battery charge cable connector plug to panel
receptacle identified by the words “12-VOLT D.C.”
• Connect battery charge cable clamp with red handle to
the positive (+) battery terminal (Figure 6).
• Connect battery charge cable clamp with black handle
to the negative (–) battery terminal (Figure 6).
• Start engine. Let the engine run while battery recharges.
• When battery has charged, shut down engine
NOTE: Use an automotive hydrometer to test battery
state of charge and condition. Follow the hydrometer
manufacturer’s instructions carefully. Generally, a battery is
considered to be at 100% state of charge when specific
gravity of its fluid (as measured by hydrometer) is 1.260 or
higher.
Cold Weather Operation
Under certain weather conditions (temperatures below
40°F [4°C] and a high dew point), your Generac generator
may experience icing of the carburetor and/or the
crankcase breather system.
In an emergency, use the original shipping box as a
temporary shelter:
• Cut off all flaps.
• Cut out one of the long sides of the box to expose
exhaust side of unit. Ensure a minimum of two feet
clearance between open side of box and nearest object.
• Cut appropriate slots to access receptacles of unit.
• Start unit, then place box over it.
IMPORTANT: Remove shelter when temperature is
above 40°F [4°C].
For a more permanent shelter, build a structure that will
enclose three sides and the top of the generator:
Figure 6 — Battery Connections
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