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[ST] Strange electrical problem



Not actually about an ST but they share a pretty similar engine these days
so I figured it was kind of relevent :-)

About a year ago I fitted an underseat exhaust to my '02 Speed Triple. To
fit the new exhaust a new metal battery box and under tray was folded up.
Within a few weeks of riding the bike with the new exhaust it started to run
rough (especially when cold) and after a while the speedo backlight started
to flicker. A bit longer after that the headlights started to flicker too.

Just after it first started happening I had the bike serviced and the
computer had an error code that corresponded with a loose connection. They
found that one of the battery terminals was loose and tightened it which
seemed to solve the problem. However it reappeared a few days later. I found
that for the first few times if I tightened the battery terminals and moved
the wires around a bit it seemed to fix the problem but lately it doesn't
seem to solve it (although it may still improve it).

They only flicker at certain rev ranges to start with but if left they get
worse and start flickering all the time. It's also a very regular flicker
(like it conicides with a spark plug discharge or something) rather than an
intermittent variable one.

It's still on the original battery so replacing that is an option but I'm
not sure if this sounds like a battery related problem or not. One final
point is the computer is now mounted to a metal battery box where it was on
plastic before. Being earthed like that shouldn't matter should it?

This is really starting to drive me mad so any suggestions would be much
appreciated.

Phil
'02 S3


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