Not starting after gassing up

[drsib]

Originally Posted by jalapenos

Check all your ground connections for cleanliness and tighten. Your condition sounds like a ground fault to me...

Will do! Thanks

[drsib]

Originally Posted by FoothillRyder

After sitting for a week (or even an hour) the ECU is nice and cool, and will have different needs vis-a-vis supply voltage than it does after it's gotten nice and hot on a ride. Not trying to defend my point, just providing some clarification.

Oh! I'm glad you clarified, because I completely missed your point first time round. This would fall into both "hot start" and "bad battery" categories...
Thanks!

[DEcosse]

Originally Posted by FoothillRyder

After sitting for a week (or even an hour) the ECU is nice and cool, and will have different needs vis-a-vis supply voltage than it does after it's gotten nice and hot on a ride.....

can't see that makes any difference .........

[sergey]

I've had the same problem with my 2010 Speed3. The symptoms were exactly as you're describing: my bike wouldn't start after short stops (typically gas station), but would start fine if left alone for 20-30 minutes. My local Triumph service has finally been able to diagnose the issue, and the problem was: faulty starter drew 180 AMPS when hot. They replaced the starter and starter clutch. All parts were covered by Triumph, I've paid for the labor.

[FoothillRyder]

Originally Posted by DEcosse

can't see that makes any difference .........

Well, here's the deal lad. The ECU has a slew of sensors attached to it, and when the silicon is hot the thresholds are different than they are when it is cold (or cool). The voltage supplied by the battery during the starting sequence - if low enough - could cause some of those 'triggers' not to work as expected. Circuits internal to the ECU might also be affected.

Might not be related; but it's possible.

[DEcosse]

Lad? Been a VERY long time since anyone called me that

Sorry FR, but that's just nonsense - the ECM draws well under 1 A - sensors draw at most only a few mA each and electronic components have negligible change in operational specs based in a fairly typical operating range from -40 to 150 C


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[Joe Houle]

dayum. that just happened.

[DEcosse]

Originally Posted by sergey

My local Triumph service has finally been able to diagnose the issue, and the problem was: faulty starter drew 180 AMPS when hot.....

Wow - now that would certainly do it

A fairly simple test to see if same problem would be to check voltage across battery when hot, with lights on - if not sagging significantly under 10A load from lights & is measuring over 12V still, measure voltage again while cranking - normal sag while cranking should be in the order of 11.0V with a well-charged battery.
Of course if battery is not fully charged it will sag further, even if starter is normal - the key would be how much it sags with just the lights
Compare your hot & cold voltages for these conditions:
Resting (off); lights/ign on & cranking



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[Joe Houle]

Originally Posted by DEcosse

Wow - now that would certainly do it
A fairly simple test to see if same would be to check voltage across battery when hot, with lights on - if not sagging significantly under 10A load from lights & is over 12V still, measure voltage again while cranking - normal sag while cranking should be in the order of 11.0V
Of course if battery is not fully charged it will sag further, even if starter is normal - the key would be how much it sags with just the lights
Compare your hot & cold voltages for these conditions:
Resting (off); lights/ign on & cranking



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Like I mentioned, desulfate, top off, load test. I'm thinking its a simple tired battery.

10.3v is your magic "no start" number

[DEcosse]

Sulphated battery would be worse after sitting a week vs just charged off the bikes generating system
The hot vs cold voltage tests above will tell a lot


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