Melting fuse box holder

What is your question?

If I use a jumper to bypass the ECM relay, the car will start. But, after driving a minute the ipdm housing box begins to melt the plastic. It has gone through 4 holder boxes so far and they all start to melt from the outside bottom corner...closest to the right motor mount...facing the drive belt. What is producing that much heat that quickly?

What makes this problem better or worse?

Nothing. Same all the time. Have changed out some questionable wires but still happens

How long has your 2004 Nissan Altima had this problem?

2 months ...after I changed the alternator