Sprint Sprint St Headlights

Discussion in 'Sprint & Trophy' started by Fourbears, Oct 19, 2018.

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  1. Fourbears

    Fourbears Noble Member

    Dec 8, 2017
    498
    413
    Norfolk
    Both relays are switching so I think its a problem between there and the lights. I have power coming out so it must be a cable break. Just a case of trying to find it!
     
  2. Oldyam

    Oldyam Grumpy Old Git

    May 14, 2017
    610
    500
    ireland
    Which headlamp works with the relays removed ?
     
  3. Fourbears

    Fourbears Noble Member

    Dec 8, 2017
    498
    413
    Norfolk
    Right-hand (offside). Which looks correct from the wiring diagram and makes sense for the UK.
     
  4. Oldyam

    Oldyam Grumpy Old Git

    May 14, 2017
    610
    500
    ireland
    So the fault is in the LHS earth / chassis connection from the bulb connectors.
     
  5. Fourbears

    Fourbears Noble Member

    Dec 8, 2017
    498
    413
    Norfolk
    There is no power to the LHS. I think it might just as easy to rewire using DeCosse's guide. Fairly straightforward and I don't have to find the break!
     
  6. Fourbears

    Fourbears Noble Member

    Dec 8, 2017
    498
    413
    Norfolk
    Although finding the earth might be helpful too. Any ideas where it might be located?
     
  7. Oldyam

    Oldyam Grumpy Old Git

    May 14, 2017
    610
    500
    ireland
    I thought you said you had power to the bulb connector on the RHS with the relays in ?
     
  8. Fourbears

    Fourbears Noble Member

    Dec 8, 2017
    498
    413
    Norfolk
    No power to the actual LHS bulb connector but there is power out of the relay. Tomorrow I am going to rig up a bypass straight from the relay to the connector. If that works its a break somewhere in the harness.
     
  9. Oldyam

    Oldyam Grumpy Old Git

    May 14, 2017
    610
    500
    ireland
    It would be odd for both high & low wires to be broken between the relays and the bulb connector did you check for voltage with a meter from the bulb connector to chassis / earth ?
     
  10. Fourbears

    Fourbears Noble Member

    Dec 8, 2017
    498
    413
    Norfolk
    Just thinking about it, it is strange that if those two small link wires are bridging the power wires, on both plugs, then I get dip/main beam on both lights. Yet if I put the relays in I only get the RHS light. The relays are clicking, the lights work but not with relays which is strange. So I can conclude that there is not a break as the lights actually work.
     
  11. Fourbears

    Fourbears Noble Member

    Dec 8, 2017
    498
    413
    Norfolk
    Well I've found the problem. The relays I bought are the wrong type. I still had a Durite one which I slotted in and the lights work. I now have to find a similar one.....
     
    • Like Like x 1
  12. Oldyam

    Oldyam Grumpy Old Git

    May 14, 2017
    610
    500
    ireland
    Good to hear, Durite are a common car type relay most motor factors should be able to sort you with another, take the one you have with you for the reference number.
     
    • Agree Agree x 1
  13. Fourbears

    Fourbears Noble Member

    Dec 8, 2017
    498
    413
    Norfolk
    Relay purchased, fitted and lights working! And somewhat brighter than before which was the point of doing all this! Thanks for everyone's help.
     
    • Like Like x 3
  14. Markf5983

    Markf5983 New Member

    Apr 20, 2014
    0
    1
    Hello mate
    Glad you got your lights sorted I was wondering if you could give me some help. I’ve just purchased a 2006 st1050. Both headlights work simultaneously but when putting the main beam on, the power only seems to go to the small ‘side light’ bulb in front of the central - what looks like a reflector.
    I know nothing about electrics so was wondering if you could advise in simple terms! Thanks in advance
     
  15. Fourbears

    Fourbears Noble Member

    Dec 8, 2017
    498
    413
    Norfolk
    The first thing that springs to mind is a blown bulb . Beyond that it could be a blown fuse or a faulty relay. I would check things in that order to start.
     
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