Thanks for all that helpful info. I did find that dodgy earth point you suggested and have relocated the earth to another position, as well as adding an extra earth from the battery to the engine. The battery is brand new, I have had it load tested and "it passed the test". Now I have another issue, the throttle "blipper" is not working... aarrggh, what next?!
The sad news is that unless whoever did the battery testing knows about Spyders and knows to look for a
minimum voltage of 12 volts under starting load instead of the 10.5-10.7 volts that many, especially old school types &/or testing devices that aren't specifically set up for Spyders generally consider is 'OK', then just saying '
it passed the test' may not be anywhere near good enough.
See my earlier post - Even a brand new battery can be a dud, especially if it wasn't charged properly (for at least 8 hours) before installation, or if its brand new capacity is anything much less than 350 CCA & 21 A/hr - then even (or possibly even more so) the fact that the throttle blipper is not working could be a sign of a dead or dying battery!
Unlike the old school 'points & plugs' engines that many mechanics/auto electricians learned on, or the settings that many 'not strictly the latest tech' load testers are set to work on, where pretty much anything better than about 10.5 volts can generally be taken to mean that particular battery 'passes the test',
Spyders are REALLY power hungry, and if the tester (the person &/or the device) doesn't actually
look for
at least 12 volts minimum under starting load, then just 'passing the test' isn't necessarily a good enough result, you need to know the numbers, cos without them, you still don't really know if the battery is up to the task. And again, even brand new batteries can be duds, especially if they haven't been initialised and charged properly
BEFORE installation... did your 'new battery' get that done properly? Or were you just told by some retailer/a tech you don't really know from Adam that they did all that on a battery they just pulled off the shelf and fitted to your Spyder within an hour of you asking??
Sure, a dead or dying battery is not definitely the ONLY possible cause of your issues, but unless you
know that the voltage reading on the battery under starting load is showing
at least 12 volts or better when the computers, all the sensors, the steering assist (a MASSIVE power load), the SE gear selector, the starter, the ECU, and a bunch more electronic devices are all loading up the battery as the engine cranks over, then checking anything else is pretty much a wild shot in the dark! If the battery voltage is dragged down below 12 volts while all this is going on, then it's definitely going to take the charging system a moment or two, maybe even a fair bit of a longer while to re-charge the battery back up again once the peak load drops off,
IF the battery &/or charge system happens to be in good enough condition that it can even take/do that re-charge, but in the meantime (ie, saaay, maybe for the next hour or so of riding with 'higher than idle' revs),
anything electronic might not work properly - and that 'anything' juuust might include the throttle blipper!
So, it might sound as if I'm just being pedantic about this, but really, you do need to
know that your battery voltage doesn't drop anything much below 12 volts under starting loads - just '
passing the test' isn't really anywhere near good enough.
Sorry...
