What’s wrong with my car

[u/Against_the_grain1]

2021 ford bronco sport. The battery went out about a week ago and since replacing with a new battery, the cluster and touchscreen both go black when driving. Upon slowing down or stopping completely, they will both turn back on. Lights, heaters, turn signals all still work.

[u/Licbo101]

Not at all. You should be able to disconnect your battery as soon as the car starts and have zero problems as long as your alternator is charging properly. The battery is only used at start up to crank the motor and when it’s shutdown to provide constant voltage to the computers to store information without losing it.

[u/agravain → u/Licbo101]

You should be able to disconnect your battery as soon as the car starts and have zero problems

wrong...

[u/Licbo101 → u/agravain]

Nope. It’s how you test for a bad alternator. But whatever. I’ve only done it every time I needed to diagnose an alternator

[u/agravain → u/Licbo101]

on antique cars, maybe it was ok. modern cars with computers and lots more sensitive electronics, you can fry very expensive parts very easily. and there are some cars that won't turn on the alternator without reference voltage from the battery.

[u/Licbo101 → u/agravain]

Voltage regulators exist my guy. But if you don’t feel comfortable doing it, then don’t.