Category Archives: FAQ

Military Diesel Generator FAQ

Wiring Diagrams for MEP002A & MEP003A Military Diesel Generators


We have had requests for diagrams for the MEP002A and MEP003A wiring.  In this post you will find 3 high resolution photos of a new Control Box that we have in stock (yes, it’s for sale;-). Hope this helps you with your electrical needs.

Can I Run My 120/240V Wired House With A 120/208V Three Phase Generator?

Below is a great video that concerns itself with answering this oft-asked question. Many military generators are only configured to output three phase electricity, especially the larger units including the MEP004A, MEP005a and up.  Note that the MEP002A and MEP003A models output single phase 120/240V single phase power just fine and are not the focus […]

How To Break-In a New Re-manufactured Engine or a New Refurbished Generator from GMG


We get this question A LOT!  Some customers buy new MEP002A or MEP003A re-manufactured engines from GMG. Some buy our refurbished generators complete. In either case, we recommend a Break-In period, especially for re-manufactured engines.  For refurbished generators, we recommend an early oil change in the 50 hour range (vs the normal 100 interval) to […]

What Does GMG Recommend for Diesel Fuel Additives for Military Diesel Generators?

                We get this question a lot. There are many good products on the market and regional availability is an issue. You want to choose an additive that is in good supply in your area (your country).  We recommend using Power Service products in general and recommend using […]

My Generator Is Not Generating, But The Engine Runs; Help!


One of our recent customers had a small scare with their new generator. Nothing dramatic, just puzzling. The engine started normally and everything seemed 100%, except for one issue:  no electricity was being generated to the main terminals or the convenience outlet.  Frustrating to say the least. The customer and GMG tried most of the […]

The World’s Smallest Portable Diesel Generator: The Dewey Electronics MEP-531A for the US Military


OK, maybe it’s not the lightest, but I would say it’s the smallest generator of it’s kind.  A tried and true electricity in a box product. Simple, extremely rugged, intelligent and, most of all, mobile.  In deciding to stock this product, we had to think of a lot of factors.  Those included: Dealing with higher […]

All Military Generators – All in One Place!


We have finally assembled what we believe is a relatively exhaustive list of past and present generators used by the US Military.  On this page, you will also see links to two versions of the: STANDARD-FAMILY-OF-MOBILE-ELECTRIC-POWER-GENERATING-SOURCES-GENERAL-DESCRIPTION-INFORMATION-AND-CHARACTERISTICS-DATA-SHEETS-MIL-HDBK One version was published in 2010 (MIL-HDBK-633A) and one published in 1998 (MIL-HDBK-633).  Both of these manuals have very […]

GMG Approved For International Exports

[Halifax, Vermont: February 15, 2013]  GMG has recently obtained approvals from the U.S. Department of Defense, the U.S. Department of State and the U.S. Department of Commerce (specifically, the Bureau of Industry and Security) to export demilitarized generators globally (with specific exceptions such as Iran, North Korea, Cuba). This has taken considerable time and effort to […]

How Noisy Are MEP002A and MEP003A Military Diesel Generators? The Same As Honda’s Best Worksite Unit!

GMG gets this question a lot!  Many opinions can be had about the noise level of MEP-002A and MEP-003A diesel generator units. To protect your hearing around any engine or machinery, wear hearing protection! It’s cheap and your friends and family will thank you when you’re not screaming at them or the TV is blasting! […]

A Word About Our Batteries

Below are the specs for civilian batteries for the MEP003A and MEP002A generators: MEP003A Units: Battery BCI # : BCI #24R Battery Height : 9″ Battery Length : 10 3/4″ Battery Voltage : 12 Volt Battery Width : 6 3/4″ Battery Cold Cranking Amps @ 0 Degrees F : 675 Battery Cranking Amps @ 32 Degrees F : 850 Battery Posts Type : Top Post Battery Reserve Capacity (Minutes) : 115 Battery Weight : 40 lbs […]

New Ambac M-50 Manuals Posted


These manuals are for servicing your Ambac M-50 Fuel Injection Pumps for your MEP002A or MEP003A units. Not that we recommend that the average person attempt to service or rebuild your injection pump, but we want to provide all of the manuals we can find for you.  GMG will begin to offer a rebuild program […]

GMG Launches Exclusive Lifetime Parts Discount Program

GMG Lifetime Parts Discount Program: [Halifax, Vermont: October 17, 2012] GMG is proud to announce the establishment of the “GMG Lifetime Parts Discount Program.”  It is effective immediately and is retroactive to all of the many customers who have previously purchased generator sets. All customers who purchase a complete generator from Green Mountain Generators will receive 10% […]

Selecting Correct Injection Pump Timing Button and Injection Pump Installation for you MEP-002A or MEP-003A Ambac Fuel Injection Pump

Selecting Correct Injection Pump Timing Button and Injection Pump Installation for you MEP-002A or MEP-003A Ambac Fuel Injection Pump M50/PSU IF NO. 3136 1/21/2009 1 Printed in USA Rev Level A Ambac International, 910 Spears Creek Court Elgin SC 29045(USA) – North America Telephone: 1-800- 628-6894 Fax: 1-800-542-8230 Website:   DOWNLOAD THIS FILE:  Ambac-Timing-Button-For-M50-Injection-Pump-MEP002A-MEP003A-IF_No._3136 Selecting Correct […]

Fuel Consumption For Diesel Generators


This chart estimates diesel fuel consumption for a generator based on the size of the generator and the load at which the generator is operating.  Please note that this table is simply an estimate. Many other factors will affect the fuel efficiency of a diesel generator including design, fuel quality, air quality, and frequency of […]