Home > In Car Electronics > Radio Interference with Headlights on Full Beam |
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sako243 Member Since: 08 Jul 2014 Location: Wales Posts: 1224 |
If I understand the problem - you're only getting the interference when you've got high-beam on?
I'm assuming that you still have filament headlights? If that's the case then the first thing I'd check is the light-bar. Disconnect it so that it doesn't come on and see if your problem still exists. If it's a cheap light bar then they've probably got utterly crap constant current drivers for the LEDs in them which got damaged by the welding. Where was the welding being done? MIG or TIG (steel / ali)? Did you put the earth clamp close to the weld puddle? Ed 82 Hotspur Sandringham 6x6 95 Defender 110 300Tdi |
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28th Nov 2019 11:03am |
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Harry.O Member Since: 25 Jul 2014 Location: Warwickshire Posts: 716 |
Thanks for the reply Sako243.
The interference is only on high beam, this also triggers an LED light bar via a relay. The headlights are JW Speaker LED units and the light-bar is a cheap version but they have both been on for over a year with no problems beforehand. I'll pull the light bar later and see if that makes any difference The welding was to the towing assembly so quite high amp MIG to steel and the earth clamp was also attached to the assembly - circa 8 inches away. The battery leads were removed before we started, which caused the radio to reset to factory settings but I don't think that would have made a difference to anything else? 2005 Td5 110 Hardtop 1989 300Tdi 90 Soft top 1992 200Tdi 90 Truck cab with Land Cruiser axles |
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28th Nov 2019 12:03pm |
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sako243 Member Since: 08 Jul 2014 Location: Wales Posts: 1224 |
Try the light bar first, then perhaps the headlights since they're easy to disconnect.
Failing that I'd suggest swapping out the head unit if possible as that may have also been damaged. Afraid it's just a game of narrowing down the problem. Another (remote) possibility might be the alternator since when you turn on the high beam it might wind up how much its outputting. Ed 82 Hotspur Sandringham 6x6 95 Defender 110 300Tdi |
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28th Nov 2019 12:06pm |
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Shax Member Since: 05 Oct 2010 Location: London Posts: 391 |
A common mode choke in the feed to the light bar will help cut some of the interference.. It works a bit like the suppressor capacitor you put on a petrol distributor... ... ,-------,
.. I [__][_]|__ .. I __ |"_|"__| .. "(o)====(o)" ^^_-^-_^-^_^^^^^--^^^^ PAUL G7ALW 14.200 USB 26FB458 / 27.275 SSB |
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3rd Dec 2019 11:35pm |
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captain slow Member Since: 22 Jun 2011 Location: Herts Posts: 355 |
I had a similar problem. Gary @ audiofile (who fixed it) put it down to interference from the LEDs. have a chat with him - he knows his stuff. https://www.audiofile-incar.co.uk/ he's very good with Defenders 2.2 Tdci 110 XS CSW Corris Grey
Prince Harry's D3 (gone but not forgotten) 300 Tdi 110 CSW (gone but not forgotten) |
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4th Dec 2019 2:01pm |
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Harry.O Member Since: 25 Jul 2014 Location: Warwickshire Posts: 716 |
Thank you for all the replies so far unplugging the light bar saw the radio signal return with the headlights still on high beam but I noticed this weekend that switching on the rear worklights causes the signal to go again so pretty sure it's the head unit playing up since the switch is located besides the head unit... seems like an excuse to upgrade to DAB!
Harry 2005 Td5 110 Hardtop 1989 300Tdi 90 Soft top 1992 200Tdi 90 Truck cab with Land Cruiser axles |
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9th Dec 2019 9:34am |
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