I guess I answered my own question. Code C on the manifest is the HD batt and is the std. GTO battery. I have a manifest with the C batt and a "U" Alt. U must be the 37 amp job. So the 55 amp alt is std with A/C and if one could order a 55 amp alt as an option they would also get the Delco 558 HD batt. The HD batt does not trigger the 55 amp alt.
Last edited by War eagle; 08-23-2016 at 11:35 AM.
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