So today i was finishing mine and another friends car, taking all of his boost parts and putting them on mine. His car was running resistor box for the injectors so i took that out and swaped it all to mine. I repinned the dead connector and plugged that cap back in it. -- this is whats suppposed to be done if taking the box out correct? before i swapped out ecus i knew the fuel pump was working because i heard it come on. after i thought i was all ready everything was good to go i turned the key in his car to start and instantly it blew the 7.5 backup fuse and now it doesn't do anything at all. no crank. no fuel. no start. any suggestions would be great. thanks.. both cars are ej1's the no start car is a dx if it makes any difference.

 

found out the the main relay have voltage to 4 pins when key on... not normal. any one have any help?

 

Check for more blown fuses under the hood and dash. Did you replace the Back Up fuse?

What specific main relay wires have voltage?

 

x2
Also you might wanna check your wiring as well as your grounds and constants to make sure that you don't have any loose end which may be causing that particular fuse to recieve to much voltage for that particular fuse causing it to burn out instantly.

 

got it figured. out... only one engine ground (i thought it had the normal 2, but only have the ground to the valve cover)... and it was weak... just was wierd how everything turned on (fuel pump). but right when i turned the key it popped that fuse.. and after replacing that fuse nothing would happen, no pump, and no click from the starter. thanks guys for the help i didn't get the chance to use lol.