Knowledge Base
Technical articles, product literature, installation guides, and reference documents.
Technical Articles
Difference between Delco Remy CORELESS Reman and normal Reman Starter motor
A 39MT CORELESS Reman Delco Remy Starter is a Delco Remy remanufactured 39MT heavy-duty starter motor sold without a core requirement/core charge.
Choosing Between a New Service Unit and a REMAN Unit
A buyer’s guide to alternators and starters — New Service, factory-remanufactured (REMAN), and rebuilt units compared.
Slow-Cranking Diagnostic Guide — 24V Heavy-Duty 50MT Starters
Step-by-step diagnostic procedure for slow-cranking or extended-cranking complaints on 24V Delco Remy 50MT-series starter motors, including battery load testing…
Diagnosing Starter Cranking Problems
A systematic approach to diagnosing slow cranking, click/no-crank and no-click/no-crank conditions in heavy-duty starting systems.
Tech Tip: Common Causes of Voltage Drop
Voltage drop is an all-too-common issue plaguing commercial vehicles. It occurs when there’s a decrease in the amount of available voltage in the cables and con…
Diagnosing Starting Systems Equipped with Smart IMS
How to diagnose starting issues on vehicles with Smart Internal Magnetic Switch (IMS) starters, including built-in protection features that can mimic faults.
Delco Remy Tech Tip: Flashing the Field
Remote sense—a popular feature on many Delco Remy alternators—utilizes a small sense wire that reads the actual battery voltage and signals the regulator to inc…
Electrical Soft-Start: Protecting the Ring Gear
How Delco Remy electrical soft-start reduces ring gear wear by slowly rotating the pinion before full engagement.
Overcrank Protection: Preventing Thermal Damage
How the built-in overcrank protection circuit breaker on 41MT, 42MT and 39MT starters prevents heat damage during extended cranking.
Remote Sense Technology: Why & How
How Remote Sense on Delco Remy alternators compensates for cable voltage drop, reducing battery charge time by up to 50% and cutting warranty claims by 30%.
Brushless Alternators: The Brushless Advantage
Why brushless alternators outlast conventional designs — fewer moving parts, no brush dust, and elimination of 10 common failure modes.
Oversizing & Selecting the Right Alternator
How to choose the correct alternator mounting style, output rating and design type — and why oversizing improves efficiency and battery life.
Heavy-Duty Alternators That Handle the Heat
How the 55SI and 40SI heavy-duty brushless alternators deliver high output in extreme under-hood temperatures for fire trucks, mining and off-highway equipment.
Internal Magnetic Switch Solenoid (IMSS): Simplifying Installation
How the integrated IMSS design simplifies wiring, improves reliability and withstands temperatures up to 120 °C.
Battery Maintenance & Proper Charging in Heavy-Duty Systems
Inspection, testing and charging best practices for fleet and mining managers to prevent repeated starter and alternator failures.
Documents & Literature
Delco Remy Warranty Guide
List of failures that are not warranted. These failures are not manufacturing-defects but due to system, operator, or eq
How to select a pulley for your Delco Remy Alternator
Nikko Heavy Duty AlternatorService Parts Catalog
Nikko Heavy Duty Starter Service Parts Catalog
Denso Heavy Duty Catalog
Delco Remy 2025 EMEA Starter & Alternator Application Catalog (Europe)
This is a catalogue of all the European range starter motors and alternators available to replace only starter motors on
24 Volt Off-Highway Quick Reference Guide | Delco Remy
Fast Moving Part #: Delco Remy starter and alternators of 24V used in off-highway applications in India
Diagnostic Manual - Delco Remy
Service: Diagnosing issues with Delco Remy starter motor and alternator units fitted on equipments.
Delco Remy - Warranty Approval Guide
A document showing what cases are not approved under warranty and why. Failure reasons with photographs which are not a
Charging Cable Requirements for Delco Remy Off-highway units
Using the correct specification of charging cables to connect your starter motor and alternator to the battery and the e
Delco Remy Heavy Duty Starter & Alternator - Troubleshooting Guide
Preliminary steps recommended by Delco Remy to carry out when your starter motor and alternator are not working as per y
Delco Remy International Warranty Policy
The International Delco Remy Limited Warranty for Manufacturing Defects as declared by the manufacturer. Details of the
Delco Remy Diagnostic Procedures Manual (Warranty & Preventive Maintenance)
As the diagnostic procedures in this manual become part of your routine preventative maintenance program, here are two
Why should you use a Delco Remy alternator?
Here is a case study and write-up on why Delco Remy alternators perform superior to other alternators in the same segmen
19010002 Service Parts Catalog
Brush Alternator Service Manual - 1G-286
DELCOTRON Transformer Type Alternators - Service Bulletin 1G-280
Brushless Alternator Service Manual 1G-500
Leece Neville Heavy Duty batteryless Alternators
1117805 Service Parts Catalog
1117733 Service Parts Catalog
50MT Cranking Motors - Service Bulletin 1M-156
50MT Cranking Motors - Service Bulletin 1M-153
1117647 Service Parts Catalog
1117642 Service Parts Catalog
10478998 Service Parts Catalog
1990483 Service Parts Catalog
10478911 Service Parts Catalog
Service Parts catalog for legacy Delco Remy Starter motor to part number 10478911. This unit is obsolete and no longer i