Did Display; Alternators; Identifying A Defective Alternator; Alternator Identification - PREVOST H3-41 Maintenance Manual

SECTION 06: ELECTRICAL

12.2 DID DISPLAY

In the DID you will find the percentage of trip
made with regenerated electricity displayed
along with the instantaneous fuel consumption.
This value is reset each time the engine is
restarted.
FIGURE 62: PRIME DID DISPLAY
In addition to the standard voltage gage, the DID
also includes a state of charge gage for the
batteries:
FIGURE 63: BATTERY STATE OF CHARGE
This gage displays the level of charge for the
12V and 24V battery banks in percentage.

13. ALTERNATORS

Standard configuration includes three 24-volt
150A, self-regulated, belt driven, air-cooled HD
10 BOSCH alternators are used in the 24-volt
electrical system.
NOTE
For the complete
instructions, refer to Maintenance Information
MI16-17 Bosch HD10 alternator removal
and installation included at the end of this
section.
As an option, two 24-volt 250A Delco Remy
55SI alternators may be installed. One on each
side of the engine.
74 PA1621 Maintenance Manual All Series | Revised Sept 2019
removal/installation
In this configuration, the multiplex system will
identify the alternator on the right (cold side) as
Upper Right and the left (hot side) as Lower Left.
13.1 IDENTIFYING A DEFECTIVE
ALTERNATOR
When an alternator is not charging,
the charging system warning light will
illuminate.
13.1.1

Alternator identification

Cold side alternators are the one found on the
A/C compressor side. The hot side alternators
are the one located on the engine turbo side.
Cold Side (R.H.):
ALTERNATOR Up RH= upper right
ALTERNATOR Low RH=lower right
ALTERNATOR Ext RH= above small A/C comp.
(MTH only)
Hot Side (L.H.):
ALTERNATOR Up LH= upper left (MTH only)
ALTERNATOR Low LH=lower left
13.1.2

Identifying a defective alternator

using the instrument cluster DID
1. On the DID (Driver Information Display),
select DIAGNOSTICS menu.
2. Select VIEW ACTIVE FAULTS and then
ELECTRICAL.
3. The active electrical system faults will
appear. Scroll through the active faults. You
will find one of the following messages:
MID (188) ELECTRICAL SYSTEM
PSID 34 ALTERNATOR Low RH
FMI (5) OPEN CIRCUIT
MID (188) ELECTRICAL SYSTEM
PSID 35 ALTERNATOR Up RH
FMI (5) OPEN CIRCUIT
charging
system
warning
light