I just realized that the Interstate batteries in my Horizon 40AD with 400 Cummins were probably installed by the dealer. Mine are 31MHD with 950 CCA.
Question to other Horizon owners: What are the specs on your cranking batteries. I need to get new batteries.
2017 Dutch Star 4369
Huey Pilot — Vietnam 1971-72
Author of: ACE, The Story of Lt. Col. Ace Cozzalio
and: The Aviators: Stories of Helicopter Combat in Vietnam 1971-72