Went on a call out to jump start one of Puget Sound Energy's trucks at their yard, they've been having problems with the truck as it is their backup truck and sits for long periods of time. Didn't take long to figure out the battery tender wasn't working, although that didn't matter as the extension cord wasn't plugged into the wall outlet anyway...
The batteries were only a month old though so even without a functioning battery tender they should not have been that low. Checked the parasitic draw and it was well over the acceptable range of 50 mA. Tracked the draw back to the customer's laptop dock which is hardwired to the batteries.
The dock only accounted for ~ .2 amps though. I had to do a voltage drop test across a couple fuses to find the remainder. My meter actually picked up the drop in auto range which surprised me being as small of a draw as it was. Followed the wire harness up from the fuse and back to the printer installed in the cab. I'm not sure why the company that installed them didn't put them on a switched power source or the auxiliary battery for the truck body.
Did some warranty work on a reman ISX here this last week, the center section exhaust manifold gasket was leaking. Nightshift tore it apart and found that the center section was warped, I installed the new exhaust manifold and the turbo that the customer wanted replaced and paid for themselves.
