Tech Tip #42: Install a new Balmar Alternator on your diesel or gas powered marine engine

Dr. Diesel
Written by Dr. Diesel


Great tips on how to install a new Balmar Alternator in your gas or diesel engine.

Do You Need More Amps? Spending Too Much Time Recharging? Install a new Balmar Alternator on your diesel or gas-powered marine engine.

  • Available for most marine engines
  • Meets USCG specifications for ignition protection
  • Replaces Delco, Prestolite, and Motorola
  • Easy to install
  • No modifications needed
  • Special Perkins models available
  • Balmar Factory website for technical information

Alternators have a difficult job to do. They operate in a hot, dirty engine room, and have to perform at full output for much of their operating life. These alternators come with oversized cooling fans and special, heavy-duty bearings. We want them to last for a long time.

Our small and large frame Balmar alternators are easy to install and will give your electrical system the added boost you’re looking for. Add a new alternator that will give you 100 amps, 125 amps, 150 amps or go all the way up to 200 amps! Our Balmar pricing includes the necessary separate voltage regulator (the catalog warehouses don’t include the regulator.)

Alternators should be 25-40% as large as your battery capacity for effective charging. Most small frame alternators range between 75 and 100 amps while large frame alternators range from 100 to 200 amps. Small frame alternators measure about 7″ from the mounting bolt hole to the adjustment strap hole. Large frame alternators measure about 8″. Give us a call with your engine model and voltage requirements and we’ll help you spec out the right alternator for your system.

If you don’t need a Balmar, let us help you find the right alternator. We’ve worked with major alternator manufacturers to find alternators that will meet the needs of many boaters including single-wire, internally regulated units that are easy to install and inexpensive.


Dr. Diesel
Written by Dr. Diesel
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