Is there some type of guide online suggesting how to build a harness for the ms? I know the idea is basic but I am trying to figure out someone elses work right now.

Basically, my harness (which came with the used ms i bought) has a few fuses wired into it but only one 3amp fuse. Before the 3am would blow after running the cra a bit but now it blows on startup. I believe it has something to do witht he relay for the fuel pump but I dont want to unwrap everything just to be sure.

 

not sure what exactly you're trying ask here, but the wiring is really easy to track and do. In this PDF there's the wiring schematic for the harness on page 6:

https://www.rx7club.com/showthread.p...ed#post7472482

All the pin numbers are right on the connector in very small font, just trace back which wire has a fuse in there and what's blowing it. If it really is the fuel pump with only a 3 amp fuse. If it is indeed a fuel pump fuel bump it up to a higher amperage fuse like the guide says of about 10 amps or just check the specs off the pump that you have and see what amperage it takes and match it.

I hope that helps in anyway.

 

hey do u know where i can get a megasquirt for the fc?

 

THeres plenty of places. diyautotune.com sells kits. Ive seen them prebuilt on ebay before. You just have to follow instructions to make them work for the fc. Check the stickys at the top of this forum for more on that.

 

I have a few plug n plays for s4 rx7s as well. Bit with the poor condition of most factory harnesses, I usually recommend building your own harness.

Ken