Rewire strat relay to bypass ECM ? - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 8 (permalink) Old 12-09-2012, 05:31 PM Thread Starter
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Rewire strat relay to bypass ECM ?

If I wanted to rewire my start relay to the start button in order to bypass the ECM how would I do that ?
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post #2 of 8 (permalink) Old 12-09-2012, 06:19 PM
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In a carburetted bike it could be done, but I wouldn't do it on an EFI bike. All systems go through the ECU and it's probably best not to mess with it.

You can fit an extra push-button shorting out the red/white wires on the stater relay as DEcosse shows on this post:

http://www.triumphrat.net/twins-tech...ml#post1844049
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post #3 of 8 (permalink) Old 12-09-2012, 06:37 PM Thread Starter
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Looked at the drawing and I was thinking more in the line of energizing the relays coil with the start button not shorting (jumping) its contacts.
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post #4 of 8 (permalink) Old 12-09-2012, 06:38 PM
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Just cut the wire or isolate it by removing the female pin (85) from the headlight cutout relay support . And then connect this pin of the relay to the ground chassis.

But you will loose this : the ECM wiring is clever. Because, one second or two after the engine is running, the ECM isolate this wire from the ground, preventing to run the starter engine if you press the starter button again. This button feeds the relay with 12V, even when the engine is running.
Second argument, if you do so, you will loose the clutch security which use this wire.
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post #5 of 8 (permalink) Old 12-09-2012, 07:08 PM Thread Starter
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Don't want the clutch switch. None of my other bikes have that.
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post #6 of 8 (permalink) Old 12-09-2012, 07:13 PM Thread Starter
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The wire that goes from terminal #2 of the start relay coil to the ECM... is that a ground or a hot ?

Last edited by mr1bienvenu; 12-09-2012 at 07:15 PM.
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post #7 of 8 (permalink) Old 12-09-2012, 07:25 PM
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It's a ground signal. First off make sure you are using the correct wiring diagram. Second, I would wire it through the clutch switch, but that's your choice, It's the safest. You could wire the relay coil ground to the clutch switch ground, B/O and add a diode for circuit protection. This will let the engine crank with the clutch in, starter button pushed. Remove the original ECM ground signal wire from the relay, you don't want to back feed into the ECM. No more crank, pause, etc.
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post #8 of 8 (permalink) Old 12-09-2012, 09:43 PM Thread Starter
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Thanks !
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