help on b18c4 fuse 15 keeps blowing

[mugenboy23]

hi anyone can help i have ej9 which is b18c4 swap problem is speedo goes wild when driving then checked engine light is on then the alternator doesnt charging the battery then drain fuse 15 keeps blowing what seems to be the problem? thanks

 

[Gregconboy158]

Check to see if your lambda wires are shorting together. I had this problem and it turned out to be lambda plug had melted on exhaust causing a short