Headlight keeps blowing?

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Monkeysteve
Posts: 11
Joined: Fri Jan 29, 2021 11:50 pm
Rides:: Ktm 300

Headlight keeps blowing?

Post by Monkeysteve » Fri Jan 29, 2021 11:59 pm

It’s on a skyteam 85cc
Getting 12v ac at headlight connector?
Not over charging, replaced regulator to be sure
All other lights are fine?
Any help appreciated

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Jimo
Posts: 97
Joined: Mon May 23, 2016 7:51 pm
Rides:: Honda NH125 Lead, NH80 Lead, ’78 ST70, ‘94 Helix
Location: Fakenham, Norfolk

Re: Headlight keeps blowing?

Post by Jimo » Mon Oct 04, 2021 4:09 pm

Thinking logically - what has the headlight got that no other circuit has? The DIP SWITCH, so I would look at the dip switch in particular for sluggish movement of its mechanism that could allow more voltage to pass due to delayed switching. May be a drop of WD40 might help.

Jim

loadedtoad
Posts: 888
Joined: Fri Mar 04, 2016 11:01 pm
Rides:: C90 CBR600 PE175
Location: Derbyshire-Leicestershire Border

Re: Headlight keeps blowing?

Post by loadedtoad » Wed Oct 06, 2021 5:39 pm

Two main reasons come to mind when lamps blow regularly.
Over voltage and vibration being the usual suspects.
Does the rear light blow (not brake light) as well ? you did say all others are fine so i guess not. If it does it's an over voltage issue.
Though it's possible the tail light is wired differently on these bikes but usually it's on the same AC circuit.
Does the tail light work without the engine running ?
If not i'd be checking the vibration route ,loose lamp holder, loose headlight, perhaps even a bad batch of lamps if you always buy from the same place.
I

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bikerbaker
Posts: 2810
Joined: Thu Nov 07, 2013 2:35 pm
Rides:: 1990 C90, 2016 Kayak 110, Riders Cub, 2xSV650, BMW F800GT, Buell XB12R CT90/110
Location: Rochford Essex

Re: Headlight keeps blowing?

Post by bikerbaker » Wed Oct 06, 2021 8:35 pm

loadedtoad wrote:
Wed Oct 06, 2021 5:39 pm
perhaps even a bad batch of lamps .............
If you are running 35/35w and the same as a C90 I've had 3 fail in quick succession, last one about 50 miles.

Bought some more from a different eBay shop and seeing what happens next.

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