Possible that battery tender killed ECM ?

Bird

TJ Enthusiast
Supporting Member
Joined
Jan 6, 2017
Messages
990
Location
VA, United States
Not my TJ here but in my Eagle Talon.
Lost my ECM and either it was ready to go or the battery tender was responsible as i never disconnected the battery .
I already replaced the ECM and don't want it to happen again.
It's only a 3 amp charger so didn't think it would be necessary to pull the cables.
Any thoughts ?
Car is 1990 with 89K