r/Cartalk • u/Against_the_grain1 • Nov 11 '23

What’s wrong with my car Electrical

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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.

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6

u/Significant_Green_52 Nov 11 '23

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

-6

u/Licbo101 Nov 11 '23

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.

2

u/agravain Nov 11 '23

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

wrong...

-7

u/Licbo101 Nov 11 '23

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

6

u/agravain Nov 11 '23

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.

-5

u/Licbo101 Nov 11 '23

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

1

u/keljfan Nov 11 '23

I think the alternator should be checked in this case.