the pointy end is the bow
Join Date: Aug 2006
Location: La Conner, Washington
Thanked 27 Times in 26 Posts
Rep Power: 11
Inexpensive High Capacity Alternators
I did something stupid this weekend and burned up my alternator. I started the engine while the house bank was shut off, burning up my heavy duty alternator that charges that bank. Thatís the bad news. The good news is that I learned a few things about alternators as a result of looking for repair parts for my particular alternator.
I learned that several of the high output marine alternators are based on the Delco 10dn alternator from the 1960ís and 70ís. Ample Power, Balmar, Lestek and Powerline alternators are just a few that start out with a cheap GM alternator that you can buy for under $100 new, or buy one at a junk yard for around $25. They beef it up with a stator winding capable of some extra amps, put a nice paint job on it and sell it under their name. My particular alternator was a Lestek. It was probably a $300 alternator when the previous owner bought it. Thatís about three times what itís worth.
Here are some price comparisons that I found on the internet:
Balmar 912 series Alternator $397
Ample Power 4023 Alternator $499
Delco 10DN 105 amp Alternator around $100
Balmar offshore repair kit $186
Ample power offshore repair kit $269
Delco repair kit $24.
For under $60, you can buy a used Delco 10dn externally regulated alternator from the junk yard and buy a 105 amp kit off the internet and have your own high capacity alternator.
As soon as I get my current Lestek fixed, Iím going to get a Delco rebuild kit that will fit the 1-wire alternator that runs my starting battery and my 3-wire Lestek (Delco) alternator that runs my house bank so I can repair either of them in the future should I have a memory lapse again.
1983 Fraser 41
La Conner, WA
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Boating for over 25 years, some of them successfully.