2004 350Z touring

ok in my IPDM i found my 15 amp fuse was blown (#77) so I replaced it and the car fired up. but it blew again so I read some more reading and replaced the relay for the ECM with a Titan relay because they dont sell the single relays for my Z. Again i started it up but soon the fuse blew. whats next???? coils? help please

 

i had a short in mine but i diagnosed it by eliminating everything else and a little guess work.

 

I also had a short in mine and kept blowing fuses. Bought a used one for cheap and worked ever since.

 

I checked each coil pack and they all tested good.so i took out the ipdm . and tested every fuse and every relay. also checked out good. any suggestions before i put it back together and back in. its 600 for a new one

 

my bad a little late on this, mine dint have any issues with relays or fuses they where all fine. my short was the ipdm itself, it has a circuit board and processor inside, if you take it apart your likely going to ruin it though.