Vespa ET4 1999 lights problem
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Lurker
Vespa ET4 1999
Joined: 08 Dec 2020
Posts: 3
Location: uk
Mon Dec 14, 2020 3:02 am quote
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
Molto Verboso
2006 LX150 (carbed) | 2007 GT200
Joined: 29 Jun 2016
Posts: 1189
Location: Toronto
Mon Dec 14, 2020 4:13 am quote
Hi and welcome!

You posted this in the wiki section, where it won't get much attention. You probably want to post in the General Discussion area instead.

In what condition is your battery? Have you measured the voltage when idling vs when revving?
Lurker
Vespa ET4 1999
Joined: 08 Dec 2020
Posts: 3
Location: uk
Tue Dec 15, 2020 9:31 am quote
No not checked the battery yet only just got the bike should the voltage be same or different thanks
Member
et4 125
Joined: 02 Dec 2020
Posts: 17
Location: england
Mon Dec 28, 2020 12:28 pm quote
make sure the battery is topped up correctly
& fully charged , if you have a battery charger ?
before you start testing & buying new bits

charging voltage should increase as the revs increase

if unsure you tube is your friend for how to test the charging system
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 39250
Location: Pleasant Hill, CA
Mon Dec 28, 2020 2:05 pm quote
Re: Vespa ET4 1999 lights problem
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.
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