sparkymarkpaul wrote:
Hi i have a vespa et4 125 1999 and only had a few weeks the problem having is that when the bike is on idle the lights are dim and when you rev it they get brighter is there a reason for this or is it how it is meant to be thanks
That's how it is - and it's nothing to do with the battery state of charge. The lights (apart from the brake light) are regulated AC, almost directly from the stator. Only the brake light is DC. The stator on an ET4 doesn't give out much voltage at idle, less than 12V AC - not enough to get the regulator to even keep it steady.
So dimming lights at idle on these early bikes is the norm.