PaulOR Posted February 24, 2012 Share Posted February 24, 2012 Hi All, Got a strange problem with the LH side dipped beam on my son's 350. Car is UK spec with Xenon. a. 15 amp fuse for the LH dipped beam blew, replaced it and it blew again. b. Removed bulb and tested it in the RH unit and it worked so not the bulb. c. Next most likely problem was ballast/ignition module. Replaced this tonight with a 'new' one bought from HIDS Direct and tested the light. It was fine without the engine running, started the engine and at tickover the dipped beam was OK. Blipped the throttle and the fuse blew. d. Checked Voltmeter and it is steady at 14V all revs. Not sure that it has anything to do with anything but we installed a K&N Tornado cold air system. After a few weeks we could smell burning and saw that the Carbon Fibre Lid of the Cold Air box was burning at the mounting screw points, it was about this time that the first headlamp fuse blew. We insulated the mounting screws and lips of the box but the same thing happened and shortly after the second headlamp fuse blew. Checked the Cold air box mounting and no trapped wires and the earth is good on the box. Lid has been removed and the car run for a few months with all ok. The fuse blew again a couple of days ago and now will not work when you rev the engine. I know there's a relay involved somewhere, we can hear that clicking when the lights are switched on......... What the H*ll do I do next? Quote Link to comment Share on other sites More sharing options...
M13KYF Posted February 25, 2012 Share Posted February 25, 2012 I wonder if you now have a short somewhere Quote Link to comment Share on other sites More sharing options...
PaulOR Posted February 26, 2012 Author Share Posted February 26, 2012 Well touch wood it's fixed. Took the Cold Air Filter box off and the light now works OK without blowing fuses. The box was bolted through to earth on the inner wing, the other side on a bolt on the front of the engine. It was obviously acting as an earth for the engine perhaps a not very good one. My theory is that on revving the engine, the block rocks with torque and the cold air box mounting screw on the engine moves within the boxe's bracket hole creating some sort of electrical interference. Sounds far fetched to me but I can't think of any other explanation. If the fuse lasts I may be writing to K&N and reporting this problem. In our attempts to fix this, we bought a new Ballast/igniter unit so now have one spare if anyone want to contact me by p.m. Cheers Paul Quote Link to comment Share on other sites More sharing options...
Neilp Posted February 27, 2012 Share Posted February 27, 2012 Was there not issues with the k&n system cutting through wires when fitted? Quote Link to comment Share on other sites More sharing options...
glrnet Posted February 27, 2012 Share Posted February 27, 2012 Absolutely correct Neil, it was the far bottom right corner (nearest the rear of the car) that could "sit" on the wiring loom, I took mine out and cut at least 1cm off the K & N cold box I think Biscuit might have done the same from memory too Was there not issues with the k&n system cutting through wires when fitted? Quote Link to comment Share on other sites More sharing options...
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