Identifying A Defective Alternator - Back-Probing Ae49 & Ae52 Multiplex Modules Method; Alternator Drive Belt; Removal And Installation; Adjustment - PREVOST H3-41 Maintenance Manual

13.1.3 Identifying a Defective Alternator –
Back-probing AE49 & AE52 Multiplex Modules
Method
Prerequisite conditions:
a) Engine running;
b) Parking brake applied.
Alternator Up RH =pin J1:20, module AE49
Alternator Low RH=pin J2:8, module AE52
Alternator Low LH= pin J2:9, module AE52
Back-probe pin 20 (AE49 J1:20):
If multimeter reads 1-2 volts, the upper
•
R.H. alternator is defective;
• If multimeter reads 12 volts, you have
an open circuit;
If multimeter reads 26 volts or greater,
•
the upper R.H. alternator operates
normally.
Back-probe pin 8 (AE52 J2:8) and a good
ground (use ground stud in the compartment):
If multimeter reads 1-2 volts, the lower
•
R.H. alternator is defective;
• If multimeter reads 12 volts, you have
an open circuit;
If multimeter reads 26 volts or greater,
•
the lower R.H. alternator operates
normally.
Back-probe pin 9 (AE52 J2:9) and a good
ground (use ground stud in the compartment):
If multimeter reads 1-2 volts, the lower
•
L.H. alternator is defective;
• If multimeter reads 12 volts, you have
an open circuit;
If multimeter reads 26 volts or greater,
•
the lower L.H. alternator operates
normally.

13.2 ALTERNATOR DRIVE BELT

MAINTENANCE
Drive belt
Inspect for crack or frayed material at the
intervals specified by the Lubrication And
Servicing
LUBRICATION & SERVICING.
13.2.1
1. Insert a ½" socket drive into the automatic
belt tensioner opening.
2. Twist the tensioning arm to slacken belt.
3. Remove belt.
Installation of the alternator drive belt is the
reverse of removal.
FIGURE 64: ½" SOCKET DRIVE WRENCH
NOTE
Belts specifications may vary. For proper belt
selection, always consult your vehicle Coach
Final Record.
13.2.2
Correct belt tension is required to maximize belt
life. The tensioning arm maintains proper belt
tension, no adjustment is required.
PA1621 Maintenance Manual All Series | Revised Sept 2019
SECTION 06: ELECTRICAL
Schedule in Section

Removal and installation

Adjustment

24:
75