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Old 04-11-2011, 11:43 PM   #1
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Default How do I replace the engine wiring harness in an NB

I'm attempting to help a friend rebuild his 2001 LE, after a small bit of fire in the engine bay. I have the kink to the FSM, however, it does not discuss the actual removal of the engine wiring harness whatsoever. I have another full wiring harness on the way.

I have pulled the dashboard, minus the huge 3*3 wiring connector holding it at bay.
It looks like I need to pull a bit of the AC system to re-run the wires through the firewall.

I will also need to replace the other wiring, which powers the starter/alternator. All the connectors were melted down.

Has anyone pulled the wiring out of their NB; and could you offer any advice/tips to make the job easier? Thanks for your time!
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Old 04-12-2011, 08:41 AM   #2
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When I did my my v8 swap in my '01, my motor was already out so I removed the dash, disconnected the main plug (X16 blue plug which I think that is to the right and under the gauge pod area), and just pulled everything through the engine bay and removed the whole thing. Since I removed AC with my swap, I also had the heater core and plastic box out which I think the harness runs behind.
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Old 04-12-2011, 10:39 AM   #3
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damn, I'm hoping that pulling the heater core/a/c condenser is not really needed. Trying to get this car roadworthy asap.
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Old 04-12-2011, 10:48 AM   #4
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Yeah dude, a fire in general means you should be prepared to disassemble the car.
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Old 04-12-2011, 10:52 AM   #5
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Sounds like dash is just minimally held in at this point. A/C and heater core are only another few minutes of your time. It is, what it is...
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Old 04-12-2011, 11:26 AM   #6
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Yeah, you are right. I'm just used to the relative simplicity of my NA. Far less everything involved.
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Old 04-12-2011, 11:29 AM   #7
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I know the drill well... always something when you just want to finish the task at hand.
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Old 04-12-2011, 11:48 AM   #8
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Especially when it's free labor, and not my car, lol
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Old 04-12-2011, 12:39 PM   #9
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Check out the last few pages of this build thread:

https://www.miataturbo.net/build-threads-57/2jz-miata-build-thread-41570/

Sean made a bulkhead connector for his harness. If you work on your car a lot, this feature would be very nice to have.
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Old 04-12-2011, 12:50 PM   #10
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Can you PM me a link to the FSM?
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Old 04-12-2011, 12:58 PM   #11
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look for the FSM link in the Saved Posts thread.
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Old 04-12-2011, 06:24 PM   #12
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FWIW: There are 3 wiring harness on the 2001 model.

The largest one runs from the driver headlight, into and behind the dash, and out to the psgr headlight.
--Luckily, I do not have to pull this one, as it would require removing the a/c condenser, and the heater core.

The second harness actually plugs into the ECU, and into the first wining bundle. After disconnecting, This bundle can be pulled out from under the engine bay. Putting a new one in may prove difficult without removing the heater core. This is the one that sustained the most damage.

The 3rd runs from the starter/alternator, down the PPF, to the battery. I need to replace this one as well. Have not looked into removing it yet.
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Old 04-12-2011, 06:58 PM   #13
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As others have said, it's really not a big deal to remove the heater core. Taking out the dash is the big deal. The heater core is pretty simple once that's done.

Glad to see you hanging out here!
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Old 04-12-2011, 10:07 PM   #14
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Yeah, looks like the biggest pain of the heater core is getting the hoses off without damaging the aluminum/copper lines. I was more worried that I would have to remove the a/c condenser, which does not look to be the case.

Now I have to wait for the owner to get in some new parts from FFS, a non-charred ECU harness, and the starter/alternator harness.
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