Heavy Duty Alternator

The Delco Remy 39MT heavy duty starter rotatable flange models were designed specifically to improve service flexibility and part number consolidation.

Voltage drop is an all-too-common issue plaguing commercial vehicles. In this video, we explain what voltage drop is and what to look for when upgrading your system or performing maintenance.

If you service newer trucks, you may have come across ones equipped with a dual input IMS starter. It is important to be aware of it so you can understand how it’s different so you can service it correctly. The dual input IMS starter has two wiring connection inputs, rather than one. These inputs provide both power (+12V) and ground. Together, they give the vehicle control over the power flowing in and out of the IMS when it is energized. This Tech Tip video reviews the differences between a dual input and single input IMS starter.

In this Tech Tip video we explain the proper way to remove and replace alternators equipped with remote sense.

There are many different alternator mounting positions and belt configurations on heavy duty diesel engines today.

A starter engagement system is responsible for engaging the pinion with the ring gear, keeping the pinion engaged while cranking, and disengaging the pinion after the engine starts. There are three different types of starter engagement systems that can be used in vehicles: positive shift, soft start, and indexing drive. In this tech tip video, we walk through how each works, as well as where it's most likely to be used.

Some of our newer all-makes starter models have larger mounting holes—this makes them more versatile as they are able to fit engines with either size bolt. The mounting holes on newer models are five-eighths of an inch. That’s slightly larger in diameter than the nine-sixteenths of an inch on the older models. That difference, though, doesn’t limit if and where you can use the starter. The solution to accommodate the larger holes is quite simple and inexpensive. All you need are flat washers. We recommend a grade 5 or better washer for each of the mounting holes. This flat washer accommodates the change in bolt hole size without needing anything more.

If you are unfamiliar with the IMS, you may try to remove it—not realizing its many benefits. Many of the Delco Remy brand starters come equipped with an Integrated Magnetic Switch, or IMS. The IMS provides a higher current draw for the motor. It does this by reducing voltage drop and controlling battery current. This ensures the solenoid receives the maximum available voltage in any starting condition. If you are unfamiliar with the IMS, you may try to remove it—not realizing its many benefits. However, doing so would result in significant control circuit problems. It will also void your warranty. If an IMS is part of your gear reduction starter, you should never remove, bypass or uninstall it. This video provides two options for you to consider.