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Yamyam66 |
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Yamyam66 L Plate Warrior
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- Super Spammer
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Yamyam66 |
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Yamyam66 L Plate Warrior
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- Super Spammer
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Posted: 18:13 - 20 Nov 2019 Post subject: |
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Yamyam66 wrote: | Yes both tail lights blown, the bulbs were black.
Where do i start to fix this , any ideas , simplified for a novice if possible.
Thanks for your reply by the way. |
There is no simple fix. You're going to have to chase the wires back starting from the bulb holders, looking for damage to the insulation, exposing the bare wire. Maybe where it's rubbed against a chassis or frame part. Sometimes it can be a tyre which has worn through the insulation on the wire too.
If it's an Earth shorting, it could be related to an indicator wire too. ____________________ TZR250 2MA road, TZR250 1KT road, TZR250 2MA race, TDR250, YZF-750R Boost colours.
Jaguar S Type 3.0 V6 Sport R, VW Transporter T5 GP LWB Shuttle 140ps DSG. |
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stinkwheel |
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stinkwheel Bovine Proctologist
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stinkwheel |
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stinkwheel Bovine Proctologist
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Robby |
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Robby Dirty Old Man
Joined: 16 May 2002 Karma :
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Posted: 19:02 - 20 Nov 2019 Post subject: |
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For the general lack of power to the rear lights, and the fact the fuse is ok (assuming you checked the correct fuse) then I would be looking at the earth wire for the rear lights. Its a single point of failure.
In fact, to do diagnosis, I would just run a wire direct from the earth connection on the rear light wiring (wherever all of the earths join together) back to the battery negative.
The brake light can be a bit of a red herring in this sort of diagnosis, because it may run its own wires and not share anything. It's for safety, so if the lights fail you still have a working brake light.
Blowing the bulbs is a bit more unusual. If a load of bulbs go together, it means the voltage is too high. You can get this from a reg/rec failing in a particular manner, but it is unusual (they usually just fail totally, stopping the battery from charging and running the whole electrical system off the battery).
Of course, this is a 125, so have a look around the reg/rec for any dodgy wiring. If the wiring from the alternator is connected to anything but the reg/rec, or wires are rubbed bare and touching, that will cause all manner of interesting problems. |
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- Super Spammer
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Posted: 20:53 - 20 Nov 2019 Post subject: |
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stinkwheel wrote: | mpd72 wrote: |
If it's an Earth shorting, it could be related to an indicator wire too. |
A what? Are you just making shit up that sounds like things other people have said? If an earth shorts, it's still an earth.
I love lamp? |
Unless it shorts to a live feed eh? No need for the abuse. Someone could have upped the fuses to stop them blowing.
The point I was making is that if it blew the indicators too, it’s clearly not the live to the rear light shorting as they’re on different circuits to the indicators. The earths could all be in the same circuit though as they all go back to source unswitched and unfused. Saying that some lighting circuits on my camper have a common live and several earth wires to switch on different interior lights fir different features, button, door open etc.
Maybe it’s reg/rectifier, but it seems odd how it’s picking certain bulbs and not others. ____________________ TZR250 2MA road, TZR250 1KT road, TZR250 2MA race, TDR250, YZF-750R Boost colours.
Jaguar S Type 3.0 V6 Sport R, VW Transporter T5 GP LWB Shuttle 140ps DSG. |
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 21:12 - 20 Nov 2019 Post subject: |
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Short circuits don't blow bulbs. They blow fuses.
If there is a short from the live to earth, that's the definition of a short circuit on the live side. It still wouldn't cause a bulb to blow, it would blow the lighting fuse. If you feed live into both sides of a bulb, it simply wont light up because it's not a circuit.
For a bulb to light up, there has to be live running to the bulb and an earth running away from it. Testing with a meter will tell you about both of these.
For a bulb to blow, it has to be damaged (cracks letting air into the bulb or vibration breaking the filament), or subjected to an excessively high voltage.
A short circuit could stop the bulbs lighting up but I would expect it to also blow the fuse and/or melt the wires. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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steve the grease |
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steve the grease Crazy Courier
Joined: 26 Jan 2018 Karma :
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Old Thread Alert!
The last post was made 4 years, 130 days ago. Instead of replying here, would creating a new thread be more useful? |
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