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Relays

  • 31-12-2009 11:55pm
    #1
    sogood
    Registered Users, Registered Users 2 Posts: 1,258 ✭✭✭


    Season's greetings to one and all. I've posted this query already on the Rover forums but to no avail, no response. I'm trying to locate (without the benefit of a manual) the relevant relay that controls the front lights on a 2002 Rover 45 1.4

    The front main beam have disappeared and I am left with the parking/side lights and full beam, with the "normal" in between lighting missing. The fuses and bulbs check out and I have 13+ volts at the relevant bulbholder terminal, with the engine running. I also have an earth from the same terminal and even ran a temporary earth from it, just in case, but no joy. Everything seems to be in place, except any illumination! Any help appreciated as I have an NCT coming up. Great timing as usual!!


Comments

  • #2
    Avns1s
    Registered Users, Registered Users 2 Posts: 3,423 ✭✭✭Avns1s


    Are you positive that its not just two blown bulbs??

    Also, the low and high beams are generally on separate fuses, have you checked this.

    Sorry, if I am stating stuff you have already covered.


    Not particularly familiar with rover, but the relays are often in with the fuses in the engine compartment.


  • #3
    sogood
    Registered Users, Registered Users 2 Posts: 1,258 ✭✭✭sogood


    Avns1s wrote: »
    Are you positive that its not just two blown bulbs??

    Also, the low and high beams are generally on separate fuses, have you checked this.

    Sorry, if I am stating stuff you have already covered.


    Not particularly familiar with rover, but the relays are often in with the fuses in the engine compartment.

    Thanks for the response. The bulbs checked out ok and I have found the relays along with the fuses in the engine compartment. There's also a fuse box down beside the steering column inside the car and all checks out there ok too. I just dont know which relay is for what, pulling them in turn doesn't always yield much, as the component they control may not be in use at the time. I imagined the same relay controlled both the main driving lights and the full beam, but not sure where I got this notion. It's a bit of a mystery with no apparent cause for the fault, but I shall persevere. The issue arose within a day of driving through some fairly deep water recently during our spell of flooding, unlesss that's relevant. Will keep you posted and thanks again.


  • #4
    [Deleted User]
    Posts: 23,339 ✭✭✭✭ [Deleted User]


    sogood wrote: »
    and I have 13+ volts at the relevant bulbholder terminal, with the engine running

    Presumably this is with the switch for the lights on ? It must be the bulbs, if the voltage is being seen at the bulbholder and the bulb doesn't illuminate.

    What Rover forums did you post on btw ?

    http://www.rovertech.net/forum/ & http://www.rovergroup.org.uk/ would be the only ones I would expect a helpful reply from to be honest.


  • #5
    Mr.Diagnostic
    Registered Users, Registered Users 2 Posts: 937 ✭✭✭Mr.Diagnostic


    If you have voltage, ground and a good bulb then the bulb would light so you need to check again.
    Test the bulb by making sure it actually lights not just with a meter.
    I think you have done this already but if not run a length of wire from the earth terminal to the battery earth.
    Check the terminals at the bulb are not dirty or corroded.
    Measure the voltage between the battery ground and the terminal at the bulb and then compare it to the voltage between the battery positive and negative terminals. You are looking for the voltage drop here. Without going into the theory (ohms law), a measured 13v may not be an indication that the supply is correct.


  • #6
    sogood
    Registered Users, Registered Users 2 Posts: 1,258 ✭✭✭sogood


    RoverJames wrote: »
    Presumably this is with the switch for the lights on ? It must be the bulbs, if the voltage is being seen at the bulbholder and the bulb doesn't illuminate.

    What Rover forums did you post on btw ?

    http://www.rovertech.net/forum/ & http://www.rovergroup.org.uk/ would be the only ones I would expect a helpful reply from to be honest.

    Thanks for that and I will double check the bulbs as I have only done a visual check on them, Doh!! They looked fine and I thought it was odd for both to go at the same time, but I'm happy to try anything at this stage. The forums I used were at MG-ROVER.ORG. and yes, the lights were switched on when testing. Watch this space and thanks again. Thanks also to Mr Diagnostic for your input and yes, I ran a temporary replacement earth from the lampholder to earth and to battery negative to no avail, but will check out your suggestions.


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