New battery installed improperly, causing it to spark and blow fuses?

2009 TOYOTA YARIS
100,000 MILES • 1.3L • 4 CYL • 2WD • MANUAL
Avatar
TAMATI
  • MEMBER
  • 1 POST
The vehicle listed above is a Hatchback. while installing a new battery I put the wrong terminals on the battery causing it to spark and blowing some fuses which I cannot identify. How do I go about diagnosing the issue and fixing it?
Feb 26, 2025 at 9:04 PM
Advertisement
Avatar
STRAILER
  • ✓ASE Certified Mechanic
  • 54,840 POSTS
  • ASE Certified Mechanic
You are on the right track, when this happens fuses are the first place to check.

Here are two guides to help us and the main fuse locations in the images below:

https://www.2carpros.com/articles/resolving-reverse-battery-connection-in-cars-a-step-by-step-repair-guide

and

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Go ahead and install the new battery correctly and with the systems on start checking the fuses and fusible links. Start with the fuses under the hood, then seem to take the brunt of the problem. Check out the images (below). Please upload pictures or videos in your response of any problems so we can see what to help you with.
Images (Click to enlarge)
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Feb 28, 2025 at 6:27 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.