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Author Topic: All lights dim/brighten on warm up  (Read 2788 times)

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brcinema

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All lights dim/brighten on warm up
« on: 26 March 2017, 11:11:11 »
Then they are ok.

Battery and alternator tested out ok, mind you, this was after warm up.

Anyone come across this as I have searched?

Thanks.

72000 miles.
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zirk

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Re: All lights dim/brighten on warm up
« Reply #1 on: 26 March 2017, 12:22:28 »
What's the Battery Voltage doing during this period.
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Andy H

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Re: All lights dim/brighten on warm up
« Reply #2 on: 26 March 2017, 12:43:43 »
SAI fan partially seized and drawing excessive current? (assuming that a 4 pot actually has one of course ::))
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brcinema

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Re: All lights dim/brighten on warm up
« Reply #3 on: 26 March 2017, 13:53:21 »
Garage did test after warm up tbh so I don't know.

SAI fan?
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RobG

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Re: All lights dim/brighten on warm up
« Reply #4 on: 26 March 2017, 13:57:32 »
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brcinema

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Re: All lights dim/brighten on warm up
« Reply #5 on: 26 March 2017, 14:01:40 »
Andy might be right.
I didn't about this and there has been a weird noise from front left before this happened.
I'll av to look for seized fan then.
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brcinema

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Re: All lights dim/brighten on warm up
« Reply #6 on: 26 March 2017, 17:49:26 »
Cant find anything wrong at mo.

Thanks for help.
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Chazza12

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Re: All lights dim/brighten on warm up
« Reply #7 on: 27 March 2017, 06:39:06 »
Its the voltage control on the Headlight ECU Control Unit, I changed the one i had and it stopped, was going to change the capacitors and a few diodes inside before replacing it but all the board is covered in electrode sealer.   
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Re: All lights dim/brighten on warm up
« Reply #8 on: 27 March 2017, 13:52:42 »
Quote from: Chazza12 on 27 March 2017, 06:39:06
Its the voltage control on the Headlight ECU Control Unit, I changed the one i had and it stopped, was going to change the capacitors and a few diodes inside before replacing it but all the board is covered in electrode sealer.
Bo lax ;)

Only Xenon fitted Omegas have a headlight ecu, being a CD, this car should have halogen lights and no ecu :y
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Dave DND

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Re: All lights dim/brighten on warm up
« Reply #9 on: 28 March 2017, 11:08:22 »
I would be looking at the condition of the battery earth cable where it attaches to the body   ;)
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