the Sierra 3500 HD is code TP2, can any of you tell me if this is just a heavy duty battery upgrade or an additional battery ?? I have seen some older GM's with 2 batteries so the offered option has me wondering. Thanks.
Hello, as respects your question, on the 2500HD (gas) you can order it with dual batteries, 660cca or a single HD batery 770cca, and/or a HD alternator / 145 amp. Also there is an option of getting one HD battery, and one std battery.The diesels come std with dual batteries, and a single 145 amp alt. std.
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