Introduction And Description; Introduction; Description - Borg Warner Delco Remy 28MT Diagnostic Procedures Manual

Introduction and Description

1-1. INTRODUCTION

1-2. PURPOSE.
This manual provides diagnostic procedures that
can be used for troubleshooting a heavy duty electrical system,
including the starting and charging systems. Some procedures
also may be used for preventative maintenance checks. These
procedures are applicable to systems using heavy duty starters
such as: Delco Remy 28MT™, 29MT
38MT , 39MT , 41MT , 42MT
TM TM TM
adequate battery power for the engine/starter application used.
1-3. DEFINITION OF DIAGNOSIS.
process that begins when a problem is perceived and ends when
the equipment is confirmed as serviceable. Three questions must
be answered to assure completion:
1. What are the symptoms? This is what has been observed
(seen, heard, felt or smelled), indicating a problem.
2. What caused the symptoms? Diagnostic procedures are used
to identify the root cause of the problem.
3. How do we fix it? Usually this involves the adjustment, repair
or replacement of some part or parts.
1-4.
This manual defines the procedures to determine the cause of
the symptoms. Actual adjustment, repair and replacement procedures
are provided in unit-specific service bulletins and manuals.
1. Battery
2. Starter
3. Alternator
4. Magnetic Switch
5. Push Button Switch
6. Key Switch
delcoremy.com
, 31MT™, 35MT , 37MT
TM TM
, 50MT or a similar starter with
TM TM
Diagnosis is the three-part
FIGURE 1-1. Heavy Duty Electrical System
1-5.
For educational purposes, study of this entire manual is
recommended. For diagnostic purposes, the flow charts in Section
II will reference appropriate procedures for specific symptoms.
1-6. EQUIPMENT REQUIRED.
this manual, the following equipment is required:
1. A variable carbon pile load tester with more than 500 amps
,
TM
capacity with ammeter (and voltmeter).
2. A separate DC voltmeter, digital preferred, capable of reading
0.01 volt increments.
3. An inductive (clamp-on) ammeter for safe and accurate
current measurements.
4. A hand held or bench top type tester.

1-7. DESCRIPTION

1-8. SYSTEM. The heavy duty electrical system is comprised
of the starting and charging systems. These systems are, in
turn, comprised of batteries, the starter, the alternator, and the
interconnecting wiring and electrical and mechanical switches.
For maximum operating efficiency, all parts of the system must be
functioning properly.
S E C T I O N 1
To perform the tests specified in
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