You said "ECU being funny if you connect any power source to any outlet"
You aren't connecting a power "Source" to the vehicle unless the unit has internal batteries.
The ECU is far more sensitive to someone connecting another lead acid battery to the system, as in Jump Starting the Car.
A spike or trancient voltage can damage the vehicles main control cpu or ECU but highly unlikely from a dvd player or mobile phone etc.
I wouldn't be overly concerned....
If the device you attaching draws only 1-2 amps then pinching a bit of power from the reversing light is the way we all do it.
But... you can insert a device like this in between to protect your DVD Screen from transients.
ADPTR MODULE MULTI VOLTAGE REG 1 5A DC DC Converters Power Conversion...
×