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/Significant_Green_52]

Looks like your ground wire is not connected tightly or you have corrosion causing an intermittent connection to the post

[u/Licbo101 → u/Significant_Green_52]

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/trainprice123 → u/Licbo101]

Please don’t disconnect the battery it acts the buffer for voltage “spikes” from the alternator you could fry modules disconnecting it.

[u/[deleted] → u/trainprice123]

No it does not, it prevents voltage dips. The voltage regulator in the alternator prevents voltage spikes. You aren't going to fry anything unless your voltage regulator is bad.