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coat the terminals and connectors with GB #OX-100 anti-oxi-
dant compound (available at your local hardware store).
Replace and tighten the terminal connectors. Secondly, if the
terminals and connectors are making good contact, touch the
test leads to the battery and vehicle framework as described
above (see fig. 2). Note the reading of the tester. Get an
assistant to turn on the headlights while the test leads are
making contact. The reading should drop a few volts. Should
the reading drop 5 volts or more, the battery should be
charged or possibly replaced if the voltage drop is significant.
The circuit may need to be checked further for problems with-
in the electrical system that may be draining the battery.
Alternators and Generators
Set the function/range switch to the DCV range. While the
engine is idling at normal operating speed, touch the black (-)
test lead to the metal framework of the vehicle, then touch the
red (+) test lead to the output terminal connector. The alter-
nator output cable is always the heaviest gauge cable
attached to the alternator (see fig. 3). The display should read
12 volts or more. If the display fluctuates rapidly, the cable
may need to be tightened. If the engine is idling lower than is
specified in the vehicle owners manual, the voltage reading
will be lower. If the output voltage is significantly low, the alter-
nator may require service or replacement.
WARNING When making automotive measurements,
!
observe safety precautions. Stay away from the fan blades,
belts and other moving parts of the engine. Keep the multi-
tester and its leads away from moving parts.
Household Batteries
Set the function/range switch to the DCV setting. Touch the
Figure 3
– 5 –
red (+) lead to the (+) terminal of the battery and the black (-)
lead to the (-) terminal of the battery. Read the voltage level of
the battery on the display. Generally speaking, if a battery's
output voltage falls below 60% - 70% of its original rating, it
should be replaced.
DC MILLIAMP MEASUREMENT
1) Set the function/range switch to the mA setting.
2) Touch the test leads to the circuit in series (in line with the
circuit) so that the circuit current passes through the multi-
tester in order to make the measurement. If the display
reads "(-)" polarity, reverse the test leads.
Common DC Milliamperage Measurements
It is important to point out that milliamps can also be
expressed as thousandths of an Ampere. Therefore 200 mil-
liamps is 200 thousandths of one Amp. The milliamperage
function of your multitester is commonly used by electronics
repair technicians and hobbyists to troubleshoot various low
voltage circuits. Although not normally used for electrical trou-
bleshooting around the home, this function can be used to
measure the milliamperage draw of household items such as
flashlights, and similar low voltage consuming items that do
not draw more than 200mADC. In figure 4 the red (+) test lead
is hooked up to the (+) terminal of the lantern battery while the
black (-) test lead is hooked up to the bulb. The tester will indi-
cate the milliamperage draw when the flashlight switch is
thrown in the ON position.
WARNING DO NOT APPLY VOLTAGE TO THE TEST
!
LEADS WHILE THE TESTER IS SET IN THE MILLIAMP
RANGE. See #8 under "For Your Safety".
Figure 4
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