S13 or S14 Harness

[Seedlessone]

Ok guys I need some help. I bought a redtop a few months ago. It came with the harness still plugged in with a j4 ecu. I know the j4 ecu is for a s14, but what about the harness. How do I tell if its a s13 or s14 harness. Ive been told that if the s14 ecu plugged up the harness then its a s14 harness as well. Because s14 ecu wont plug into a s13 harness. Is this true? Thanks for the help

[Hijacker]

The J4 ECU is a Type-x ECU.

The S14 designations are usually along the lines of WA, WB, or WC.

[Seedlessone]

Ok so Im still confused. Tell me if I wrong with any of the below.1.The type x ecu will not work on my s13 redtop with out some repinning of my ecu.2. The harness that comes in the type x will still work on my s13 redtop and should be wired to fit just a like a redtop?

Thanks for the help.

So in short even though I recieved a j4 ecu and (possibly) a type x harness, just wire up normally following frsport s13 diagram. And all I will need is a redtop ecu and it should work? Right?

[Hijacker]

AFAIK, you should be fine just wiring it up normally. When you're doing wiring jobs, what you're essentially doing is supplying the ECU and coils with power and extending a few sensor wires.

Just make sure that at the chassis connectors next to the battery, that your wires match color to color.

I have no experience with J4 ECUs, but I was under the impression that they used a slightly different ECU plug than the 63 and E5 ECUs.

[Seedlessone]

So in other words I will need a new harness if I plan to run a redtop ecu...ie.62,63

[Hijacker]

I think.

But you have a harness with an ECU. So there's no need to order new stuff

[Seedlessone]

Yeah well I wish it were that easy. I sent the j4 back to JRE for a replacment ecu. They sent me a #60ecu for a sr20de. So now I need a ecu for a redtop and I guess a wire harness. This is great.