Yeah. But that's only the worst case. When I worked for the diesel shop, we'd get guys coming in all the time, fried ecms from them shorting out. Usually like you said , crap installs.
One guy, he deployed, lent his mom his truck, a 6 speed manual. One day she drove it to Lowes for a new washer, hit the remote start button, came out to find the lifted 3500 ram dually had driven over several cars before high centering on one after the thing started in gear