Ok, this is a long shot but it happened to me. You don't mention other symptoms so here goes.
I had an alternator power diode leakage problem that only could be found by pulling the power lead to alternator.
This was a suburban and started triggering an after market alarm when parked on a trip
Then on return journey the headlights dimmed. and since I figured we could make it home and it was in the middle severe storms we pushed on.
Next morning the battery was completely flat.
Took a while to find, new power diode assembly fixed it.
2018 Pathfinder SL with midnight pkg.
2003 Pathfinder from 2004 SE 4WD, 1June2018 Transmission expired in Temple, TX
1997 SER 5sp Manual from new Rear Ended 2009 !! Gone to the Knacker yard...
New ride 3.0 manual RWD not a Nissan !!! Gone 2016 from Hail damage.
1997 Sentra GXE from new .... Sold 2008
2001 Sunny N16 RHD from new (N16 Nissan Bluebird Sylphy) Sold
Last edited by IanH; Jun 7th, 2019 at 11:51 PM.