Admittedly, this seems like a really basic question, but I'm having a hard time finding definitive answers after lots of searching. What's the correct way to wire the power inputs on a series 6 FD?

Some context:
I'm adapting a rywire Adaptronic Modular harness that has constant and switch power wires.

The Elite has has the follow power related inputs:
A13: +12 IGN IN - It's my understanding that this is not needed/used if you're not using the ECR function (ECU outputs on A25 to switch power relays on)
B11: 13.8v ECU PWR: from reading other post it sounds like this should be switched power, if you use constant power the ECU will stay always powered
A26: 13.8v INJ PWR: Haltech states that this should be a separate circuit from the ECU power ideally, but would it be ok to use the same switched power as my harness doesn't offer any other options. Also to note, Haltech has their own PNP harness which uses the available wires from the stock harness which would indicate they're also having to use the same power wires.

Based on the above, that would mean B11 and A26 share the same switched power wire and there's no constant power input? Is that correct?
Thanks for the help.

 

You can splice A13 in with B11 and connect those on to a switched power source. The OEM power source is reliant right off of the main relay iirc. There should be a Black/White wire on pin 1B on the yellow 22 pin connector on the factory harness and that supplies battery voltage when the key is in the "ON" and "START" key position.

Injector power comes off of the Blue X-05 connector just next to the ECU mount location. There will be a big wire (10 or 12 AWG) that's Black/Yellow that runs off the main relay as well and you can hook up your A26 pin in to that. A multimeter and the FSM will be your best friend implying it uses OEM stuff.

That's just how I have my ecu set up and it appears to work

 

Thanks for the input. Just looking through the fd wiring manual now, it looks like ecu connector pin 1A is switched ignition power and the same line also runs to the blue X-05 connector you mentioned (page Z-28 of the manual). As far as I can tell, there's no switch ecu power line in the factory wiring. The only other power line going to the factory ecu connectors is constant 12v which I don't think is needed for the Elite. I thought that line was being used by my Adaptronic Modular since it was wired into the rywire harness, but according to the Adaptronic manual, that pin isn't used heh.

So where does that leave me? Just wire the 1B switched power to both B11 and A26?

 

Spoke with Haltech and here's the low down for future reference:

• You only need switch power on both A26 (injector power) and B11 (ECU power) in order for the ecu to run. If you don't run power to both you'll damage the ECU. These can run off the same power line, Haltech says people do this w/o issue, but ideally you'd have a separate switch power circuit for the ECU power. I had a separate ignition triggered relay that I was previously using for a wideband which I repurposed for ECU power and canbus power.
• If you want the ecu to be able to control all the major power relays than you'll provide an ignition input signal on A13, Power on A13 will trigger A25 (ECR output) which runs on relays for ECU, ignition, injector, and fuel pump power. You'll need to enable the ECR and ignition input functionalities in the settings section of the Haltech software. If you're not using these pins than you should disable these functions in the software. Enabling this functionality allows you to do neat thinks like keeping the engine running on key off or running the fans for a while since the ecu gets to decide when to cut power to all the components including itself.

I've setup my car with just the A26/B11 inputs and so far so good.

 

Ignition input on A13? You mean 12V constant? If switched with ignition how would it do what you are saying like allow fans to run with key off?

 

No. He explained it correctly. There is not a constant power supply to the ECU.

 

Ok. How does it control the fans after key is out?

I'm not questioning your response, I know you know your stuff, just want to understand how it's working.

 

It was confusing to me also at first, but it's actually quite smart. You should reference the haltech wiring diagram to better visualize the wiring side of it. The haltech replay box would be controlled by the ECR A25 output. The relay box itself has multiple 12v lines going to it from the battery so that's how that stays powered with ignition off. Basically the ECU gets to decide when to power off those relays via the ECR line. One of the relays provides the switched power to the ECU itself so that's how the ECU can decide when it shut itself down even after the ignition is turned off. When the ignition is turned on 12v is provided on A13 ignition input line, which wakes up the ECU and flicks the ECR output and thus relays back on.

As Chris said, and Haltech confirmed, there's no constant power to the ECU.

 

Thread revival!

So basically it looks like one could run all three (A26, B11, and A13) to the same 12V switched source? I was planning on running A13 to the back of the fuse box where power comes directly from the ignition switch, but maybe I could run all three there.

Or maybe run A26 to ECU connector B1 or X-05 so pulling the EGI relay would cut power to the injectors. I guess that doesn't matter though since pulling that relay will already kill power to the pump.