.....Steamin' hard and steady, many ten hour days, month after month, engine on high, A/C mainly on low, occassionally higher. Two-way communication is portable and tunes are MP-3 with head-phones, so no power drain from that, but after dark, all deck and running lights on etc, . . . . . never noticed any problems. I run a JD 3520-Cab and aside from transport, I always engage Load-Match and MFWD most of the time, but, as stated, no related issues.
CHEERS,
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