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jcb
Skilled



Joined: 27 Apr 2008
Posts: 1889


PostPosted: Sun May 22, 2016 12:17 pm  Reply with quoteBack to top

seem to have hit a rich vein of electrical issues!

first....
speedo died

I investigated and found the fuse to the reversing light had blown
I read that it also runs on the speed sensor being connected to the reverse light switch. made sense.
disconnected the reverse light switch ...fuse still blows.

now when I sit with the key in but ignition off and door open
if I put my foot on the brake the sidelight warning tone comes on...like I have left the lights on

I investigated and found that when the side lights are on the brake lights flicker!

WTF is going on!?>?>!
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bboy82
Experienced


Car: K04'd B5 S4 Saloon
Power: TBC
Engine code: AGB

Joined: 14 Mar 2011
Posts: 3291

Location: East Northants

PostPosted: Sun May 22, 2016 9:21 pm Reply with quoteBack to top

Sounds like a bad earth somewhere, or maybe a short across the loom. Has the car ever been rear-ended?

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ama
Knows a Bit


Car: rs4 b5

Joined: 01 Mar 2015
Posts: 101

Location: LONDON

PostPosted: Mon May 23, 2016 10:24 am Reply with quoteBack to top

hi what you could do using a multi meter measure the current flow on the earth one to a good known earth (body) and the other end to the rear light clusters earth with it connected and lights on you should see max .0.4- 0.5 volts if its any higher u have a earth problem e.g. rusty earth somewhere or resistance in the rear loom for the lights hope this helps
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ama
Knows a Bit


Car: rs4 b5

Joined: 01 Mar 2015
Posts: 101

Location: LONDON

PostPosted: Mon May 23, 2016 10:25 am Reply with quoteBack to top

hi what you could do using a multi meter measure the current flow on the earth one to a good known earth (body) and the other end to the rear light clusters earth with it connected and lights on you should see max .0.4- 0.5 volts if its any higher u have a earth problem e.g. rusty earth somewhere or resistance in the rear loom for the lights hope this helps
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jcb
Skilled



Joined: 27 Apr 2008
Posts: 1889


PostPosted: Mon May 23, 2016 11:15 pm Reply with quoteBack to top

thats great
will have a look
where are the earths usually?
seem to recall one on the left hand chassis leg to the box

any more?
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jcb
Skilled



Joined: 27 Apr 2008
Posts: 1889


PostPosted: Wed May 25, 2016 12:23 pm Reply with quoteBack to top

anyone?
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