tail/side light goes out when headlight on

[skikman]

putting a wee suzuki gs 125 together and cant get the lights to work properly.all lights work its only when i put the headlight on it cuts out the tail and side/dash lights.been switching wires around but cant figure it out.any ideas?

[Copycat73]

likely a bad earth wire.
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Whatever I post I have no citation and no intention of providing one..
caveat emptor

[cimbian]

Dodgy switch or poor earth.
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22PlusY
Current: Moto Guzzi 1100 Breva. Previous: Honda XL650V TransAlp
Bearded, Balding, Born again Buddhist Biker

[Copycat73]

ps. remove headlight bulb and try side light then.

have a good look at the stop /tail light.. if you got a good working spare put that in.
____________________
Whatever I post I have no citation and no intention of providing one..
caveat emptor

[skikman]

ended up being corrosion at the switch.bit off a clean and wd40 and it works ok now.as always i had been through everything else and had everything apart before i got to the switch.why is it always the last thing you look at?anyway im just glad its sorted.thanks again folks.

[raesewell]

it'a always the last thing you look at because once you have found it you stop looking