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weird light problem

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I have a weird problem with one of my lights - when I switch on my high beam, the LH indicator comes on too (but does not flash).

When I have high beam on and try to use the indicator the LH indicator does not work at all and when I press the hazard flashers with high beam on, the indicator on the LH side flashes together with the high beam but out of cycle with all the other flashers.

The RH side is fine and the anomalies on the LH side only happen when I have high beam engaged.

Any clues? If this is an earth problem how would I go about diagnosis?

Car is late 2000 986S ROW


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Nothing weird about it at all. Its what happens when there is a bad earth connection somewhere. The bad earth will be in the front cluster and the symptoms happen because; the high beam is a high wattage bulb (60W), therefore low resistance compared with the indicator (21W). All the grounds of all the lamps in the front headlight cluster are joined together and one wire actually connects to the ground of the car. So the current flows through the high beam, to the ground busbar in the headlight cluster (can't flow to ground here) backflows through the indicator lamp through the harness to the rear indicator lamp of that side, through the rear indicator lamp and to ground there. You will see both front and back indicators dimmly lit. So look for a bad ground connection in the front cluster. The wire will be a solid brown.

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