edpare

Sorry I wasn’t clear. The system goes from 12.6 to 12.3 or less in only two days. A corollary symptom is that my 2A trickle charger used to be able to maintain 13.6 on float but can no longer do so on this battery. Charger works fine on other batts. Thus, I have an unknown electrical drain.

I have a 2011 Silverado 2500 HD LZ with Duramax diesel. I use it to pull a travel trailer. When not in use, it is parked for weeks at a time. I often find the batteries run down and I can’t figure out why. I reckon the radio receiver for key fob commands must use something, but enough to pull the batteries below 12.6 volts in two weeks? I keep a 2-amp trickle charger on it but it can only just barely keep them at 12.8 V, much less 13.6. Any ideas?