Super Uber N00b Question on Wiring

Discuss the RB20, RB25 and RB26 series engines.
Largekid
Posts: 331
Joined: Mon Jun 23, 2003 11:24 am
Car: '96 RB S14 SE, '04 LS6 CTS-V

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Sorry guys, but I need some advice.

Back story...I bought then wrecked my white S14, Bought a Red S14 to swap everything over too. The wiring in the white car is superb and I dont want to run into all these wiring problems everyone posts about. My plan was to pull the harness completely from the white car and run it in the red car. But now i'm kinda lost a bit...

The engine harness connects to the motor, and the fuse/relay box under the hood. Harness runs thru the firewall to the ecu and gauge cluster? So essentially I can pull the fusebox, the engine harness, ecu and cluster, and rerun all of that in the new car? The chassis harness dosen't get touched does it?

Or would it be easier for me to rewire it? I'm just afraid that my wiring will leave some loose ends, and with how well everything is done now, I would rather leave it alone.

Sorry for the stupid questions, but I dont want to tear into something only to figure out it would have been better/easier to do it another way.


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Shocker
Posts: 2082
Joined: Sun Aug 01, 2004 2:40 pm
Car: 89 240sxHB rb26/30

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Harness for the engine just runs to the fusebox/relay box in the bay, then to the ECU through the firewall. The pins off the ECU run to the gauge cluster/car body ect.

You just need the lower and upper wiring harness when doing the motor swap. Technically you don't even need to do anything to the lower harness if you don't care about your reverse lights/neutral safety or speedo.

Largekid
Posts: 331
Joined: Mon Jun 23, 2003 11:24 am
Car: '96 RB S14 SE, '04 LS6 CTS-V

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Shocker wrote:Harness for the engine just runs to the fusebox/relay box in the bay, then to the ECU through the firewall. The pins off the ECU run to the gauge cluster/car body ect.

You just need the lower and upper wiring harness when doing the motor swap. Technically you don't even need to do anything to the lower harness if you don't care about your reverse lights/neutral safety or speedo.
well everything works now perfectly, so i'll take both the upper and lower from the white car to the red one. I assume the harness will disconnect at the ecu and I could get that thru the firewall? That means i'll have to pull the dash and swap the harness that goes to the cluster as well since that is all wired up correctly with the skyline gauge cluster.

this sounds like a PITA, good thing I have no time limit, lol.

l0nestar
Posts: 2251
Joined: Fri Mar 10, 2006 5:24 am
Car: 1993 Nissan 250SX
2004 Toyota Altezza
1963 Chevy Impala SS
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When did you wreck your white chassis, man?

Largekid
Posts: 331
Joined: Mon Jun 23, 2003 11:24 am
Car: '96 RB S14 SE, '04 LS6 CTS-V

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back in june/july ish I guess. Its been sitting in the garage waiting on a doner car, lol.

Darius
Posts: 4820
Joined: Sun Mar 02, 2003 9:48 am
Car: RB25DET S14 - 665 WHP (SOLD)
Location: Chicagoland

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I don't understand. Why do you need to move the fuse box to the new car? Are there obvious wiring modifications to it? If it was an A/T the only thing should be changed is a jumpered plug to act as a closed Park/Neutral switch.

If it was me, I would pull the wiring harness and ECU from the white car and plug it into the red car. Yep, the ECU plug fits thru the firewall hole. I wouldn't pull the dash apart just to replace the cluster. Maybe someone else can elaborate on what is needed to run the R33 cluster as far as wiring goes. Like does the S14 cluster plug match or does it need to be repinned or replaced? The transmission wiring will have to be redone, but that is only like 6 wires worth. Everything else should be the same unless fan wiring used the stock chassis harness etc.

Largekid
Posts: 331
Joined: Mon Jun 23, 2003 11:24 am
Car: '96 RB S14 SE, '04 LS6 CTS-V

Post

Darius wrote:I don't understand. Why do you need to move the fuse box to the new car? Are there obvious wiring modifications to it? If it was an A/T the only thing should be changed is a jumpered plug to act as a closed Park/Neutral switch.

If it was me, I would pull the wiring harness and ECU from the white car and plug it into the red car. Yep, the ECU plug fits thru the firewall hole. I wouldn't pull the dash apart just to replace the cluster. Maybe someone else can elaborate on what is needed to run the R33 cluster as far as wiring goes. Like does the S14 cluster plug match or does it need to be repinned or replaced? The transmission wiring will have to be redone, but that is only like 6 wires worth. Everything else should be the same unless fan wiring used the stock chassis harness etc.
yea, the fusebox has been rewired it looks like. To me it seems easier to pull and replace the whole unit compared to figuring out what was rewired and then redoing it myself. The cluster was wired as well, I had the dash apart reinstalling my boost and wideband gauges and it deff isn't a slight plug and play job.

Since the ecu plug will go thru the firewall, that should make things alot easier for me.....that is once I find time to get out there inbetween school and work, lol.

edit: ohh and the fan wiring comes out of the fuse box as well and there is a switch installed next to my hazards in the car.


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