ICU (ECU) Connector Pins Numbering? Help! - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 13 (permalink) Old 05-19-2019, 01:49 PM Thread Starter
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ICU (ECU) Connector Pins Numbering? Help!

I am doing a complete electrical system replacement on a 2001 Bonneville build. I have diagrams stating (by pin number) how the stock ICU pins connect to the ignition coils, pickup coils, and TPS, but nowhere can I find a source for how the pins are numbered! It’s 3 rows of 6 pins. Apparently many conventions exist on these. Near impossible to figure it out by trial and error because the ECU itself is kind of a black box. Thanks in advance for any help!
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post #2 of 13 (permalink) Old 05-19-2019, 10:56 PM
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You mean this?
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post #3 of 13 (permalink) Old 05-19-2019, 11:07 PM
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Sorry, I misread your post, referring to the 'ECU' led me to assume its an EFI bike. You need the pin layout of an IGNITER for a carbed model. https://www.triumphtwinpower.com/tri...niter-info.php
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post #4 of 13 (permalink) Old 05-20-2019, 10:18 AM Thread Starter
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Ripper, thanks for your reply. The TTP site doesn't seem to have a diagram of the stock ICU, but it does contain this statement about its own products, which might be of use:

"Pin 1 is located at the bottom right hand side of the connector when viewed from the back of the plug. Pins are numbered right to left in each row." Then it says "pin 1" is the bottom right, and implies "pin 18" is the top left.

So in other words, the numbers apply not to the pins in the ICU itself, but to the connector (which for me is a new Econoseal plug rather than the one that was on the OEM harness), and sequence looking through the back of that, which would mean the ICU itself would number the same way if looked at from the front (i.e. facing the pins).

I hope that's right! I'm afraid I might smoke the ICU if I hook it up wrong.
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post #5 of 13 (permalink) Old 05-20-2019, 12:01 PM
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Quote:
Originally Posted by NYCBonneville View Post
Ripper, thanks for your reply. The TTP site doesn't seem to have a diagram of the stock ICU, but it does contain this statement about its own products, which might be of use:

There is no difference in connection/pin function between TTP's product and the stock igniter, because TTP's igniter has to connect to the stock harness/plug. You don't really need a diagram since a listing of the pin functions is on the TTP site. However it can help you visually by studying the wiring diagram in the workshop manual (all carbed models are wired the same).


Quote:
So in other words, the numbers apply not to the pins in the ICU itself, but to the connector (which for me is a new Econoseal plug rather than the one that was on the OEM harness), and sequence looking through the back of that, which would mean the ICU itself would number the same way if looked at from the front (i.e. facing the pins).

The numbers on the TTP site apply to both connector (back side) and igniter pins. Viewing the connector from the back (which is the wire side) is exactly the same as viewing the igniter pins face on. Your above statement is perfectly correct. Your new Econoseal plug should be wired exactly as the stock plug was.


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I hope that's right! I'm afraid I might smoke the ICU if I hook it up wrong.

It depends on who did the job of wiring the new plug (or at least their competence). TTP, or myself can only speak for the stock wiring, but in order to fit the igniter the new plug needs to be wired as per stock. The info on the TTP site, and a workshop manual should give you all the information you need to double check.

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post #6 of 13 (permalink) Old 05-20-2019, 01:41 PM
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This should clarify the pin numbering and their function:


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post #7 of 13 (permalink) Old 05-20-2019, 01:55 PM Thread Starter
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Thanks for the replies. You guys are super helpful and responsive.
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post #8 of 13 (permalink) Old 05-20-2019, 03:18 PM
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I don't know if this will be helpful or not? But I'll throw it out there anyway.
In the aerospace work that I came from all the electrical connectors have the numbers on the back side of the connectors and down in the socket side. They were right next to the pins front and back. They were super, super small and required magnification to read and orientate. Worth a close look to see if Triumph did the same.

Just a thought for you. But it looks like the experts already got the info. you need.

“Its all about motorbikes. Always has been, always will be”

Neil in the Black Hills
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post #9 of 13 (permalink) Old 05-20-2019, 06:10 PM Thread Starter
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Ripper, in answer to your comments above, I am creating the whole harness from scratch -- crimping the receiving clips, implanting them in the connector, soldering up the wires, connecting the wires to the ignition coils, pickup coils, etc. So my issue is not just where the wires coming out of the connector should attach on the bike. And as for competence, I am an artist with a crimper and soldering iron, but as you can see, I don't know much about motorcycle electronics!

Back2-2, I was hoping the part would have a clue about the numbering, and got out a magnifying glass to examine it, but no luck.

I'm going to rely on Forchetto's illustration and the TTP website, which are consistent with one another.

Thanks again.
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post #10 of 13 (permalink) Old 05-21-2019, 06:20 AM
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Quote:
Originally Posted by NYCBonneville View Post
Ripper, in answer to your comments above, I am creating the whole harness from scratch -- crimping the receiving clips, implanting them in the connector, soldering up the wires, connecting the wires to the ignition coils, pickup coils, etc. So my issue is not just where the wires coming out of the connector should attach on the bike. And as for competence, I am an artist with a crimper and soldering iron, but as you can see, I don't know much about motorcycle electronics!
Just want to say, to avoid any misunderstandings, my comments regarding competency were not meant to be derogatory or insulting in any way. Where the wires from the connector attach to the bike depends very much on the competence of the person doing the work, wouldn't you agree? I was stating that the new plug or its type is irrelevant - as long as it physically fits the igniter unit it has to be wired exactly the same as the old plug. I will say, that I think you are looking at this backwards - instead of considering where the wires from the plug attach to the bike, consider where the pins of the igniter attach to the bike, then wire your new connector to transfer those connections. As far as your thinking goes, the plug becomes transparent - it is simply connecting the correct wires to the correct igniter pins. I don't know any other way to describe this but you will find it a lot easier to think that way, it will relieve you from worrying about which way around you are viewing the connector.


To reassure you about my own competence, I too am an artist with crimpers and soldering iron, and I also know a bit about bike electrics. I've done so much electrical work with members on this forum that I find that I don't need wiring diagrams any more. Forchetto, incidentally, runs a company that manufactures electronics and for diagrams, vital info and illustrations, he's your man.

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