PREVOST LE MIRAGE XLII BUS SHELLS User Manual

Section 6: ELECTRICAL
PA1553
40
FIGURE 25: VIEW OF RECTIFIER END FRAME WITH COVER REMOVED 06069
NOTE
Use an ohmmeter with a single 1.5 volts cell.
Most accurate reading will be determined
when the 300 ohms value is calibrated to the
center one-third of the scale. DO NOT USE
high voltage, such as a 110 volts test lamp to
check diodes.
To check diodes mounted in the supports for
short fields, connect the positive ohmmeter lead
to each diode lead and the ohmmeter negative
lead to each support as shown in "A", "B", and
"C" of figure 26. To check diodes mounted in the
end frame for shorts, connect the ohmmeter
positive lead to each diode lead and the
ohmmeter negative lead to the end frame as
shown in parts "D", "E", "F". The ohmmeter
readings may vary considerably when checking
diodes for shorts, but if the reading is 300 ohms
or less, the diode is probably defective and
should be replaced. A diode that reads 300
ohms or less will allow excessive reverse
current from the battery. Replace defective
diodes as explained later in this section.
To check the diodes mounted in the diode
supports for open fields, connect the ohmmeter
negative lead to each diode lead and the
ohmmeter positive lead to each support as
shown in parts “A”, “B”, and “C” of figure 27. To
check the diodes mounted in end frame for
shorts, connect the ohmmeter negative lead to
each diode lead and the ohmmeter positive lead
to the end frame as shown in parts “D”, “E” and
“F”. An infinite resistance reading indicates an
open diode. Diodes can be replaced by following
the procedure outlined under DIODE
REPLACEMENT”.
FIGURE 26: DIODE TESTING 06070

PREVOST LE MIRAGE XLII BUS SHELLS Specifications

General

Brand	PREVOST
Model	LE MIRAGE XLII BUS SHELLS
Category	Buses
Language	English