Section 06: ELECTRICAL
PA1562
33
DIAGNOSTIC menu of the message center
display (MCD). Select FAULT DIAGNOSTIC
and ELECTRICAL SYSTEM. Check the error
messages. All modules appear in error but
are not active. If an active error appears for a
module, this one was not reprogrammed. In
this case, trip CB6 once again. Wait 1
second and reset CB6. Re-verify the error
messages when "CAN" disappears from the
telltale panel LCD display.
o Do an error reset to remove all errors
(requires Password) from non-active
modules, leave the SYSTEM DIAGNOSTIC
menu and reopen to verify there are no more
errors.
5. BOSCH ALTERNATORS
5.1 DDEC SERIES 60 TWIN BOSCH
ALTERNATORS INSTALLATION
Two 28 volt 120A, self regulated, belt driven, air-
cooled HD 10 BOSCH alternators are used in
the 24 volt electrical system.
If the alternators needed to be removed, reinstall
as follows. Refer to figure 18 and 19 for
installation and to figure 20 for tightening
specifications:
1. If necessary, reinstall protector (00, figure
19) to the alternator support assembly. Use
the stud (0a, figure 19) and bolt (0b, figure
19) to fix the protector. Use some Loctite
262 red (688910) onto the threads.
2. If removed, reinstall ring bracket (1, figure
19) and L-shaped bracket (1.1, figure 19).
Fix the ring bracket using bolt (1a, figure 19)
and also bolt and nut (1b, figure 19) for the
ring bracket and L-shaped bracket. Use
some Loctite 262 red (688910) onto the
threads.
3. Mount the upper alternator using bolt and
nut (2a, figure 19), and also bolt and nut (2b,
figure 19).
4. Mount the lower alternator using bolt and
nut (3a, figure 19), and also bolt and nut (3b,
figure 19). Fix the lower portion of the
alternator using nut (3c, figure 19).
5. Mount the cable bracket (4, figure 19) and
fix using bolts (4, figure 19).
6. Mount pulleys (5, figure 19) onto alternators.
7. Install alternators belt (6, figure 19).
NOTE
Final tightening of the pulleys can be
performed once the belt is installed. This will
help keep the pulley from turning when
tightening.
5.1.1 Alternator Drive Belt
Removal
1. Insert a ¾‘’ socket drive into the automatic
belt tensioner opening (Fig. 19).
2. Twist the tensioning arm to slacken belt.
3. Remove belt.
NOTE
Belts specifications may vary. For proper belt
selection, always consult your vehicle Coach
Final Record.
Installation
Installation of the alternator drive belt is the
reverse of removal.
5.1.2 Adjustment
Correct belt tension is required to maximize belt
life. The tensioning arm maintains proper belt
tension, no adjustment is required.
MAINTENANCE
Check for wear and proper tension every 6,250 miles (10 000 km) or twice a year, whichever comes
first.
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