Rear light problem...

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pedros

Active Member
Posts
287
Discovery 2 facelift: I've had a search but can't find the answer to this 'un.

When there's no lights on and I press the brake, all three brake lights come on as normal. When I put the lights on, the rear lights are on as normal. But when the lights are on and I then press the brake, the offside brake light doesn't work and the other offside light goes out. The high level light and nearside lights all work normally.

I guess because they all work at some stage, the bulbs are okay. So there's obviously a connection fault somewhere, perhaps an earth? Any ideas before I go ferrreting there, assuming the weather lets me sometime soon. Thanks. :)
 
sounds like you have an earth (negative) fault i would think on the o/s light unit.
track the wiring back to where it connects to the body and i would expect it's broken off or rotted.
 
If you have a tow-bar fitted with the electrics, whoever fitted them may have connected into the light wiring and perhaps rather than doing the connections properly just bodged it.
May be a big pudding joint wrapped with insulating tape somewhere at the rear.
The normal routing is up the rear offside pillar at the light cluster. The correct fitting for the tow-bar electrics is also located there.
Remove the four screws holding on the cluster and you should be able to access the wiring.
 
Thanks folks. Blowing a gale and raining hard here in sunny Cumbria, so will attack the ROS cluster/wiring when the God of weather calms himself down, which I hope will be sometime before spring.
 
Okay. Disconnected the towbar electrics, thinking that may be the most likely problem, and now all the offside lights work okay. But the problem has transferred to the nearside. All brake lights work with no driving lights on, but with them on, now the nearside brake light doesn't work and the driving light goes out when the brakes are applied.

I'm confused...
 
Problem solved! What was it? Ummm...not sure.

Took both high level lenses off, checked all the bulbs and visual check of wiring. All seemed okay, but problem persisted. Then I thought I'd check the earths. They are situated on the rear seatbelt bolts. Not easily accessible, so I thought I'd cut into the earth leads (which are black) and earth them, to see if that worked. Did the offside one first and that resulted in no rear lights or brake lights and a blown fuse. Replaced the fuse, then everything decided to work. Re-attached the towbar wiring and still everything worked. Can't duplicate the fault at all. Everything just works okay. A little annoying, but I guess there must have been a dodgy connection somewhere that with me fiddling with everything righted itself. Or perhaps the fuse was dodgy before it blew altogether. Ho hum, happy it's fixed. But would've liked to have known what was wrong.
 
I may be talking out of my arse but if you had a short but it wasn't getting a good earth so it was unable to blow the fuse. So when you replaced the earth it was enough the then blow the fuse.

Often I have fixed motorbikes just by taking the time to clean electrical connections.
 
pedros said:
Problem solved! What was it? Ummm...not sure.

Took both high level lenses off, checked all the bulbs and visual check of wiring. All seemed okay, but problem persisted. Then I thought I'd check the earths. They are situated on the rear seatbelt bolts. Not easily accessible, so I thought I'd cut into the earth leads (which are black) and earth them, to see if that worked. Did the offside one first and that resulted in no rear lights or brake lights and a blown fuse. Replaced the fuse, then everything decided to work. Re-attached the towbar wiring and still everything worked. Can't duplicate the fault at all. Everything just works okay. A little annoying, but I guess there must have been a dodgy connection somewhere that with me fiddling with everything righted itself. Or perhaps the fuse was dodgy before it blew altogether. Ho hum, happy it's fixed. But would've liked to have known what was wrong.
Click to expand...

told you it was an earth fault :rolleyes:
 
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