my girlfriends 00 Si was missing the fuse for the tail lights/ horn so she replaced it
Now, when she turns on the headlights, the horn blares.

I was thinking it could be the ground for the headlights and horn, or she put in the wrong type of fuse.

Does anyone know where the ground is located?

Any other ideas?

We're stumped on this one, so any help will be greatly appreciated.

 

whats tha history of this car.. did she buy it usedd?

Go get a haynes manual -or a helms manual.. youll need it for future issues...

it should hold answerz to what u seek

 

Although she may have gotten the wrong fuses, amp. rating shouldn't change the function, let alone make a circuit do something else. Check the placement of the fuses and make sure they are right. Next I would do what the other guy said and go buy a helms...check the relays for the headlights and the horn over. Goodluck

 

dude your girlfriend drives an si, you're the man.