Ford Electric Ranger 2001 Manual page 832

VOLTAGE CHECK
Connect one lead of test lamp to a known good
ground or the negative (-) battery terminal. Test for
voltage by touching the other lead to the test point.
Bulb goes on when the test point has voltage (Figure
4).
FUSE BLOCK
C1
C2
C3
TEST
LAMP
BATTERY
M
Figure 5 – Short Check
A fuse that repeatedly blows is usually caused by
a short to ground. It's important to be able to locate
such a short quickly (Figure 5).
1. Turn off everything powered through the fuse.
2. Disconnect other loads powered through the
fuse:
D Motors: disconnect motor connector (Con-
nector C4 in Figure 5).
D Lights: remove bulbs.
3. Turn Ignition Switch to RUN (if necessary) to
power fuse.
HOW TO USE THIS MANUAL
4. Connect one Test Lamp lead to hot end of blown
fuse. Connect other lead to ground. Bulb should
glow, showing power to fuse. (This step is just a
check to be sure you have power to the circuit.)
5. Disconnect the test lamp lead that is connected
to ground, and reconnect it to the load side of the
fuse at the connector of the disconnected compo-
nent. (In Figure 5, connect the test lamp lead to
connector C4.)
D If the Test Lamp is off, the short is in the dis-
connected component.
D If the Test Lamp goes on, the short is in the
X
wiring. You must find the short by discon-
necting the circuit connectors, one at a time,
C4 until the Test Lamp goes out. For example,
in Figure 5 with a ground at X, the bulb goes
MOTOR
out when C1 or C2 is disconnected, but not
DISCONNECTED
after disconnecting C3. This means the short
is between C2 and C3.
SELF-
POWERED
TEST
LIGHT
OR
OHMMETER
Figure 6 – Ground Check
Turn on power to the circuit. Perform a Voltage
Check between the suspected inoperative ground
and the frame. Any indicated voltage means that the
ground is inoperative (Figure 6).
Turn off power to the circuit. Connect one lead of
a Self-Powered Test Lamp or Ohmmeter to the wire
in question and the other lead to a known ground. If
the bulb glows, the circuit ground is OK (Figure 6).
The circuit schematics in this manual make it easy
to identify common points in circuits. This knowledge
can help narrow the concern to a specific area. For
example, if several circuits fail at the same time,
check for a common power or ground connection
(see Power Distribution or Grounds). If part of a cir-
cuit fails, check the connections between the part
that works and the part that doesn't work.
For example, if the lo beam headlamps work, but
the high beams and the indicator lamp don't work,
then power and ground paths must be good. Since
the dimmer switch is the component that switches
this power to the high beam lights and indicator, it is
most likely the cause of failure.
VOLTAGE
CHECK
USING
VOLTMETER
VOLTS
2-4
2001 ELECTRIC RANGER VEHICLE