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Car electrical advice #719891
26th Aug 2012 12:15pm
26th Aug 2012 12:15pm
Joined: Jul 2012
Posts: 2,518
Merseyside
Willo_ Offline OP
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Willo_  Offline OP
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Merseyside
I think I may have a issue, (well to be honest I have a few, but just want to sort this out first)

When I disconnect my 2 earths on back lights, 1 for each side, the lights are still working,

For instances, my stop and tail lights has 3 wires, 1 earth 1 for stop lights 1 for tail lights, if i disconnect the earth, the bulb still lights up.

It is not caused by bulb earthing through light houseing, as the housing is all plastic.

Last edited by BurgerChips; 26th Aug 2012 12:17pm.

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Re: Car electrical advice [Re: Willo_] #719937
26th Aug 2012 2:11pm
26th Aug 2012 2:11pm
Joined: Oct 2010
Posts: 641
bromborough
johncon Offline

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johncon  Offline

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bromborough
The lights are earthing back though other bulbs if you put indicators on at the same time the tail lights will dim as the indicators flash . why do you disconnect the earth's any way ?


I am too old for this lark !!!
Re: Car electrical advice [Re: johncon] #719938
26th Aug 2012 2:17pm
26th Aug 2012 2:17pm
Joined: Jul 2012
Posts: 2,518
Merseyside
Willo_ Offline OP
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Willo_  Offline OP
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Merseyside
Because if i keep them connected the revs drop when i switch on headlights


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Re: Car electrical advice [Re: Willo_] #719940
26th Aug 2012 2:30pm
26th Aug 2012 2:30pm
Joined: Oct 2010
Posts: 641
bromborough
johncon Offline

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johncon  Offline

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bromborough
Have you checked the engine earth's make sure good conections from battery to chassis and engine to body. a quick check for this is put a jump lead from engine to negative on battery and see if problem persists !


I am too old for this lark !!!
Re: Car electrical advice [Re: johncon] #719947
26th Aug 2012 3:16pm
26th Aug 2012 3:16pm
Joined: Jul 2012
Posts: 2,518
Merseyside
Willo_ Offline OP
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Willo_  Offline OP
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They are all new earth leads, and are all clean, and have put extra earths on.


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Re: Car electrical advice [Re: Willo_] #719950
26th Aug 2012 3:24pm
26th Aug 2012 3:24pm
Joined: Oct 2010
Posts: 641
bromborough
johncon Offline

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johncon  Offline

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bromborough
all points towards alternator I see from one of your other posts this has been changed why did you change it ? ie was this fault there before changing the alternator ?


I am too old for this lark !!!
Re: Car electrical advice [Re: johncon] #719953
26th Aug 2012 3:47pm
26th Aug 2012 3:47pm
Joined: Jul 2012
Posts: 2,518
Merseyside
Willo_ Offline OP
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Willo_  Offline OP
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The fault was not there till alt dies on me, i got alt fixed, and then it started, so i got brand new alt, fault still there.
put a ford genuine alt on, and some of the other symptoms i had have gone, but still left with this one.


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Re: Car electrical advice [Re: Willo_] #719962
26th Aug 2012 4:01pm
26th Aug 2012 4:01pm
Joined: Oct 2010
Posts: 641
bromborough
johncon Offline

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johncon  Offline

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Joined: Oct 2010
Posts: 641
bromborough
That dont sound good. poss original prob may have damaged ecu /body control module sorry cant be of more help .


I am too old for this lark !!!
Re: Car electrical advice [Re: johncon] #719963
26th Aug 2012 4:03pm
26th Aug 2012 4:03pm
Joined: Jul 2012
Posts: 2,518
Merseyside
Willo_ Offline OP
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Willo_  Offline OP
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Merseyside
Its had a new ecu fitted, that was running on car i took it off perfect.

I still believe its a earth fault. But finding it, is proveing impossable.


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Re: Car electrical advice [Re: Willo_] #720085
26th Aug 2012 9:12pm
26th Aug 2012 9:12pm
Joined: Dec 2003
Posts: 5,683
Bebington, Wirral
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DavidB Offline
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Bebington, Wirral
So the only problem you have is with the rear lights? There are no other electrical problems with the car?
Was the alternator overcharging?
The brake lights are only earthed when the brake switch is closed - this is located above the brake pedal (usually) - stick your hand above where the brake pedal is and fish around for two wires and a plunger switch. These are pretty standard on all cars, I've had a couple go myself, when they brake the lights stay on. Just an idea. smile


"C20 LET bang"

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