# GLA Fuse Box **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [January 13, 2020, 4:12am UTC](https://community.cartalk.com/t/gla-fuse-box/156428 "2020-01-13T04:12:32Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Brendangoss7\_162028](https://avatars.discourse-cdn.com/v4/letter/b/919ad9/32.png) [@Brendangoss7\_162028](https://community.cartalk.com/u/Brendangoss7_162028)\ **Post date:** [January 13, 2020, 4:12am UTC](https://community.cartalk.com/t/gla-fuse-box/156428/1 "2020-01-13T04:12:32Z")
Hey guys - I have a Mercedes 2015 GLA and recently my car battery went flat. Since then, the key no longer connects to the car. I have researched this and have been told I need to change the fuse with a 7.5 amp. I don’t know however which one this is, as in the fuse box there has a lot of 7.5 amp slots. Can anyone show me which one it is? ![image](https://global.discourse-cdn.com/cartalk/original/3X/f/e/fe0a9a1b7c8d19d73e956185eab685861f9e57e2.jpeg) ---
**Author:** ![Brendangoss7\_162028](https://avatars.discourse-cdn.com/v4/letter/b/919ad9/32.png) [@Brendangoss7\_162028](https://community.cartalk.com/u/Brendangoss7_162028)\ **Post date:** [January 13, 2020, 4:14am UTC](https://community.cartalk.com/t/gla-fuse-box/156428/2 "2020-01-13T04:14:36Z")
![Fuse](https://global.discourse-cdn.com/cartalk/original/3X/c/0/c08b0f6bdcdba18ef3b1a499d8630404404afbb2.jpeg) ---
**Author:** ![Cougar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cougar/32/21348_2.png) [@Cougar](https://community.cartalk.com/u/Cougar)\ **Post date:** [January 13, 2020, 5:03pm UTC](https://community.cartalk.com/t/gla-fuse-box/156428/3 "2020-01-13T17:03:00Z")
Unless there is a blown fuse somewhere just replacing a fuse isn’t going to fix anything. You should look for a blown fuse. There is an easy way to do that using a simple test light probe, so you don’t have to remove the fuse in question. Use the probe tip to check the metal tabs on each side of the fuse. A good fuse will show a light on both sides of the fuse when power is ON. A bad fuse will only have one side light up since the element inside is blown out.