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Message:: [QUOTE="torque621, post: 11264155, member: 232663"]I am running into an issue with my APU. It was hard starting my low voltage disconnect alarm would sound briefly when starting. More frequently lately it would show crank limit msg, then the other day it wouldn’t even try. I tapped the starter and then it started. Based on that I figured the starter was bad. I purchased a new one and installed it. In order to make access to the starter easier I removed the alternator. I then replaced the starter and reinstalled the alternator. I started the APU and seemed fine. Put my skirts back on and buttoned everything back up. I ran comfort monitor all night and did not have an issue. The next night when I turned on comfort monitor it ran fine then my lvd alarm went off and turned my power off. I reset my lvd and it did the same thing again when I ran the APU. That night the battery monitor mode kicked it on and again tripped the lvd. Fast forward a couple of nights of not using it. Decided to give it a shot again and still having trouble with it tripping lvd when it is running.  Can the alternator actually put a drain on the battery when running?  I have cleaned the contacts with electronic contact cleaner and the truck batteries are less that a year old.[/QUOTE]