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Need advice after reversing my battery

Joined
Nov 13, 2025
Messages
6
I messed up and put a new Monster battery in backward. I know, but it happened. Now I need help figuring out what else I broke besides my pride. I realized the main fuse, number 32, was blown, so I replaced it. That seemed to help a little because now the headlights turn on but that is all the power I have. The dashboard is completely dark and the starter button does nothing. I don't even hear a click when I try to start it. Replacing that main fuse should have fixed the issue and prevented major damage but it didn't.

Did I fry some other important electronic component even with the fuse in place? I need to figure out my next step.
 
Last edited by a moderator:
that can happen to anyone, man. the headlights are still working, which means your main power is getting through the initial circuit. The problem is definitely a secondary circuit fuse or a relay
next, you need to check every single fuse in your fuse box, not just the main one. the instrument cluster and the starter circuit are typically on their own separate, smaller fuses.
Also, listen closely to the main power relay and the fuel pump relay, they often fry before the fuse blows completely when polarity is reversed.
 
secondary fuse definitely needs to be checked. but since the starter button does nothing and you hear no click, the starter relay and associated diode need to be checked too
 
Not the first to have done it if it's a mid-2000s. Probably blown the starter driver on your ecu, but that's it. You can check. But have you figured it out?
 
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