I accidentally put positive on negative and negative on positive on my 03 Evo8.
Had a long day and of course this happens 😔
I checked my battery fuse and looks fine.
Just hopping i didnt do any damages to ECU or anything that could cause me $$$.
I did some res and could it possibly be the fuse box screwed to the terminal that blew?

 

does the car start and run fine? Is anything misbehaving? If you fried anything, it will be the ECU. If it does not start, check and see if you have a reference voltage at your sensors. If you do not, then most likely you at a minimum destroyed the reference output regulator. This regulator will provide consistent voltage to many things.

 

It does not do anything at all.
No lights no crank nothing

 

Also the battery was completely dead on the evo so i jumped it negative to positive and positive to negative.

 

pop the cover on the bigger fuse block under the hood and check the bolted in fuse at the bottom. Use a Digital Multi-meter in beep/continuity mode on both sides of the fuse to verify it is intact. Fuses can look visually fine but can be blown.

 

I will do that today!
Is there any fuse that could had blown under the daah?

 

many of the fuses could have blown. You will have to work your way through the different circuits if you find something isn't working. Since nothing is working I pointed you at the main fuse for everything to start with.

 

I checked all fuses and there all good
I didnt check the main one.
Il do that next

 

Fusible Link No.1 is the main fuse for everything.

 

I appreciate it alot man
Il check tomorrow when i head back to garage

 

I tested fuse link 1 and seems to be good along with all other fuse.
What would be your 2nd step?
Maybe battery fried and didn't trigger anything 😬. Was a dead battery from the beginning just to mention

 

yeah you def need to have a working battery or nothings going to work. You can take it in to an auto store and they will usually test it for free.

 

Thanks!
Il look stop by tomorrow

 

Bet you just need a new battery now and all will be good again

 

So i got that battery tested and is no good! Most likely is that battery!
Will be getting a new one soon!
I appreciate yal!!
Thanks 🙏?