Erratic engine idle when switching high beams

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Aug 28, 2021 | 05:36 PM

cossie2

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From: Croatia

Erratic engine idle when switching high beams

Hi,
as above what could cause erratic idle/engine sputters on cossie when switching lights or high beams...Checked main earths and alternator all seems fine..
Any thoughts would be great..thanks

Aug 29, 2021 | 09:57 AM

Caddyshack

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From: Guildford

I would run a dedicated earth to the ECU and lights etc. To rule that out, it has to be some noise or an earth. May be worth getting the alternator checked by a specialist too.

Aug 29, 2021 | 01:20 PM

cossie2

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From: Croatia

Great..thanks will try that.......alternator checks alraedy done....removed the lights relay and than switched on lights..still same..this will take some time to sort out

Sep 27, 2021 | 06:05 AM

rayben

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From: East London

Using a multimeter, check the voltage when your car is running and as you turn the high beams on.

Sep 27, 2021 | 04:53 PM

cossie2

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From: Croatia

.......Thanks...it was earth issue some kind so i have routed new earth wire from engine block to ecu pins 1 and 19......all is well now.....Time for new loom i quess