> Let me change/expand the wording a bit...the trailer battery will charge to the trucks battery voltage level...to add to the conversation this truck (Canadian version) also cuts back the charge voltage to a 12.5 +? level when the battery is fully charged and operating voltage is as needed, not needed to charge itself or an other. Got caught thinking alternator had failed on the road after an hour or more, even the test meter showed 12.5vdc, got home /shut it off and re-started and high charge came back, factory built in feature.
Thanks for the clarification, Phil. Newer GM vehicles have a feature that reduces the alternator output once the battery is charged in order to reduce the alternator load and squeeze out a tiny bit better fuel economy. I'm not sure my Duramax has this feature, but the gassers do. Also, I'm pretty sure there's a diode somewhere (maybe in the trailer brake control module) to prevent the trailer battery from backfeeding when you hit the starter. Diodes introduce a voltage drop of about 0.7 volts. The result is there's not a lot of voltage getting to the trailer battery under the best of conditions, and probably none when the alternator output is reduced.
The next time I hook up my trailer I'm going to check the battery voltage with and without tow mode turned on.
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