I think the question asked to lessen overkill.
To answer that. Pretty sure a group 24 battery works.
I called American Diesel and 2X I didn't understand their answer.
So I researched the starters used on Ford 120s. They only draw a little over 300 amps from what I could determine.
So anything above 400 CCA should work..and that is a small battery.
I didn't trust my math so I have been using a Walmart Maxstart rated around 900 CCA and it was perfect for about 7 years as I am on my second one. I think it's rated for diesel trucks and like a group 31.....maybe a tad bigger.
The new ratings on batteries mean nothing to me yet....it's a 50 something but overkill. 2 Batts or bigger is WAY overkill.
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