I found that at times, running the lights and wipers, while towing just about maxed out the output of the alternator. This is with the TM hooked up and the refrigerator, and fan on. That along with charging the TV and TM batters the voltmeter was drooping down to 12.75 or so volts. I just finished getting a Reman alternator built up to 160 amps. Everything looked good on the last trip.
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