Hi, I have a 2005 Honda LX Odyssey. For about a year I’ve been having it sit for more than a week and then it needs to be jumpstarted. Using a current amp multimeter connected in series to the negative wire and battery terminal, I traced the problem to the rear back up lights by pulling the interior fuses one by one until the current dropped from 600mA to zero. The culprit was the 7 1/2 amp fuse for the backup lights.

I can think of several options from here: 1. Replace the relay that control the back up lights (haven’t located it yet), 2. Replace the switch in the gearshift, or 3. Pay U-Haul to check the trailer hitch splices they installed years ago without issue.

My problem when thinking about these is that each seems unlikely to create a vampire current when the back up lights are off and the car is parked. Does anyone have experience tracking down this type of problem? It’s been easy so far to troubleshoot, and I don’t wanna go down any rabbit holes. Thank you.