jstarg
L plate rider.
Posts: 31
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Post by jstarg on Mar 17, 2011 21:26:42 GMT 1
hi, last year when i took my 82 350lc for the mot, i got an advisory about a bad earth on the headlight. the tester told me to run a separate earth off the head light to the frame etc. is this correct ? i know cars have the body earth but somethings telling me that the wiring loom carries the earth back to the battery on an lc am i right ?
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paulo
Thrash Merchant
Posts: 406
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Post by paulo on Mar 17, 2011 22:06:46 GMT 1
Hi mate, all the bikes electrical earths including the battery's are earthed to the frame via the round eyelet at the rear coil bolt fixing. Headlamp and front indicators are all earthed at the same wiring earth connector within the headlamp bowl, just make sure they are clean and tight. If you have problems with the headlamp, then a direct earth straight to the frame (good clean metal) will tell you if the problem lies within the wiring earth circuit. The wiring design is 30 years plus and the minimum of frame earthing points has been used i.e x1. Cost is always fact-ed into the design / manufacture, extra earthing just costs more, take it from someone who works in the manufacturing industry. Not sure want type of bolt was used originally, but I've just recently fitted a new harness and have used a "cutting bolt" for this fitment - we use them at work on all our earth fixing - they cut into the thread of the captive nut ensuring a good long lasting connection.
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Post by bare on Mar 18, 2011 19:53:31 GMT 1
Yama harnesses were crappy, no news there. Take one apart and almost ..always.. the black wires show melted insulation somewhere. Attach a decent (new/additional) ground wire from the battery to the frame and one from the engine and the mess 'o wires inside the headlight to the frame. Easy cheap and could save you serious aggro.
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higgsy
Thrash Merchant
Posts: 458
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Post by higgsy on Mar 23, 2011 7:15:18 GMT 1
I've learnt over the years with racing TZR's and the LC to have as many earth points as possible, the standard two earths are not enough, so I run seperate earths from components wherever I can, easy to do and saves a load of grief. I don't have many electrical failures these days so there must be something in it ;D
Although the lc earth does indeed go back to the battery, that in turn is earthed to the frame, hence negative earth, by adding wires within the earthing circuit and grounding to the frame you are just adding strength to the circuit
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Post by Norbo on Mar 23, 2011 7:27:59 GMT 1
I would agre you have nothing to loos a few extra earths is a good idea
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