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flasher problems!!!!

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Hi fine folks,

I have just failed an M O T on my lights........head lights and all work fine, indicators work fine, hazard lights work fine etc etc.......BUT when you turn left indicator on while the head lights are on it stops the indicators from working.......please help...restest tomorrow...........

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Check the earth connection that the headlights/left-front indicator uses.

It sounds like you've got a high resistance there. Indicators will work OK when the headlights are off because the low current needed to activate the indicators will be earthing itself by the current going back to earth through the headlight-bulb filaments. When the headlights are on there's already 12-volts there so no way for this 'back current' to flow for the insufficiently-earthed indicators.

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