After improperly connecting battery cables the lights on the dash and A/C gauges stopped working

LUANTON

MEMBER
2005 TOYOTA COROLLA
5.0L
2WD
300,000 MILES

Hi there guys, I really need some advance. I connect my car battery wrongful and after the that I my car dashboards, radio, emergency lights, air-conditioning and gauges didn't work. The car did start normal, but my battery light did stay on. I checked my fuses and replace all of them and its still not working. Then I checked the 100A fuse and found out is blown. Can that be the problem guys?

3 Replies

SCGRANTURISMO

MECHANIC
4,897 POSTS

Hello,

It could be the cause of some of your vehicle's symptoms. In the diagrams down below I have included a diagram with callout for your vegicle's Engine Compartment Fuse/Relay Box. Please go through this guide and determine what controls what and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros

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Monday, July 8th, 2019 AT 4:08 AM

LUANTONS

MEMBER
3 POSTS

Hi guys, I replace the main fuse 100Amp and that was the problem but my battery light didn't switch off. I drove a few miles and it still stayed on. I switch off my car and lock my door and the next day my doors don't want to unlock. What could be the problem now? Also, my car is making a weird sound what could be the problem off that? Here are a video. Guys, thank uou so much for your help.

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Wednesday, August 14th, 2019 AT 8:00 AM

SCGRANTURISMO

MECHANIC
4,897 POSTS

Hello again,

That sounds like something is loose and rattling around. Have you checked your alternator yet? This might be the bearing in your alternator pulley going out and that might be why your battery light is illuminated. Here are a couple of links down below for you to go to:

https://www.2carpros.com/articles/how-to-check-a-car-alternator
https://www.2carpros.com/articles/how-to-replace-an-alternator

Also could you take a reading with a multi-meter of the voltage across the two battery terminals for us. If you do not have a multi-meter to get a voltage reading., here is another link for you to go to to down below test your battery:

https://www.2carpros.com/articles/car-battery-load-test

Please go through these guides and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros

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Wednesday, August 14th, 2019 AT 12:40 PM