Gromit Posted February 23, 2008 Share Posted February 23, 2008 Evening all, I've got a bit of an intermittent fault on the sister's 110, which I obviously can't reproduce now Anyway, Lights off or parks and the indicators work fine. With dips on, the front and rear OS indicators glow dimly. OS indicator doesn't work. NS is fine. I think that the main OS light does not light fully. First thought was the column switch, but if there was a crossover from the lights to the indicator at the switch, I thought it would cause the indicator to flash rather than just glow? Am going to pull the switch out and start shorting the feeds to see if I can reproduce it. Any ideas? I guess as the fault affects one side of the truck, the problem is before the fusebox. Cheers, Quote Link to comment Share on other sites More sharing options...
Fatboy Posted February 23, 2008 Share Posted February 23, 2008 Gromit, I'd startt working on confirming the earths are okay before playing with supply +ve's as the earths are more likely to corrode and become ineffective. Its also easier to test. Remove a rear light cover and fit a length of wire to a good earth point, then touch it on the outside of the bulb (metal part obviously). If the brightness changes intensity, you then know that you need to take the unit out and clean the body where the earth screw goes. Before putting it all back together, pop a tad of grease onto the bare metal to prevent future corrosion. Good luck. Quote Link to comment Share on other sites More sharing options...
LandyManLuke Posted February 23, 2008 Share Posted February 23, 2008 Earth problem for sure, usually is when one circuit starts interfering with another. Quote Link to comment Share on other sites More sharing options...
Gromit Posted February 23, 2008 Author Share Posted February 23, 2008 Yes, was going to look at the earths too. On this: Remove a rear light cover and fit a length of wire to a good earth point As both the front and rear indicator show the fault, am I right in deducing that the fault has to be before the fusebox? (As the fault is completely random at the moment, just trying to narrow down my choices when the fault does arise) Quote Link to comment Share on other sites More sharing options...
LandyManLuke Posted February 23, 2008 Share Posted February 23, 2008 It's highly likely both earths, front and rear, are bad. they often are. Quote Link to comment Share on other sites More sharing options...
Gromit Posted February 23, 2008 Author Share Posted February 23, 2008 It's highly likely both earths, front and rear, are bad. they often are. Rear lights and indicators are new 2 weeks ago, so I'm confident they are ok. Was just wondering if my logic was correct Quote Link to comment Share on other sites More sharing options...
Guest diesel_jim Posted February 23, 2008 Share Posted February 23, 2008 Rear lights and indicators are new 2 weeks ago, so I'm confident they are ok.Was just wondering if my logic was correct But both front and rear lights share the same earth circuit i think,.... so one of them could have "died" a while back and you wouldn't have noticed any difference, but now the "other" one has gone duff, you've got the problems. definately earth related though. Quote Link to comment Share on other sites More sharing options...
TheRecklessEngineer Posted February 23, 2008 Share Posted February 23, 2008 It is the earth for the OS headlight cluster. It is earthing through the OS front indicator which of course is connected to the back. Quote Link to comment Share on other sites More sharing options...
landmannnn Posted February 23, 2008 Share Posted February 23, 2008 I had an interesting one a few years ago. I had replaced a rear sidelight bulb. (twin filament side and brake light) A few weeks later one evening on a bit of a hill I turned the ignition off. The engine kept running even though I had taken the key out of the ignition. Very confusing. It turned out there was a short in bulb itself. Because it was dark I had got the lights on. With my foot on the brake the brake light circuit was taking 12v from the sidelight circuit and then powering the ignition. A long winded way of saying that just because your light units are new does not mean they are working correctly. Quote Link to comment Share on other sites More sharing options...
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