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Thread: Trailer light on dash.

  1. 22nd February 2019, 01:55 PM #11
    ballbag
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    There is a relay each for right and left, which I presume are flasher cans.

    I have LED rear indicator lights so my indicators flash quicker than normal.

    Surely it's not the computer sensing lower resistance and increasing the flash rate?
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  2. 22nd February 2019, 08:32 PM #12
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    Bohica
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    The faster flash is to tell you that a globe has blown.
    D2a Td5 Manual, Chawton White. aka "Daisy"
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    Before I had a Land Rover I did not have any torque wrenches. Now I have three.
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  3. 22nd February 2019, 11:06 PM #13
    ballbag
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    Trailer light on dash.

    Well not really. The faster flash is just a result of lower resistance in the circuit....

    Otherwise the computer has some sort of logic to detect and respond to it.
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  4. 23rd February 2019, 01:44 AM #14
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    sierrafery
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    Quote Originally Posted by ballbag View Post
    Well not really. The faster flash is just a result of lower resistance in the circuit....

    Otherwise the computer has some sort of logic to detect and respond to it.
    The IDM(part of interior fusebox) is monitoring the current draw:

    Quote Originally Posted by RAVE - Electrical library - Description and operation 4.127
    With the contacts closed, the feed from fuse 14 also passes through the relays and is
    connected, via resistors, from the passenger compartment fusebox to the direction
    indicators. The IDM controls the flasher operation by momentarily removing and restoring
    the earth for the relay coils, which opens and closes the contacts causing the indicator bulbs
    to flash on and off.
    The resistor is used by the IDM to monitor the current drawn through the resistor by the
    direction indicator bulbs. If an indicator bulb fails, the IDM detects the drop in current draw
    across the resistor and operates the flasher relay at a faster speed. The faster flash is also
    transmitted to the instrument pack to inform the driver of the bulb failure
    Discovery Td5 (2000), manual, tuned
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  5. 23rd February 2019, 08:23 AM #15
    ballbag
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    Well there you go. Thanks for the info.
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  6. 1st March 2019, 11:22 AM #16
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    same for a rangey

    Hi,

    it works the same for the 2000/2001 Rangey. I do tow, and I find it is a very useful feature.

    As pointed out before, if you have extra indicators (eg Bull Bar mounted lights) then fit them with LEDs and your problem is solved and your trailer indicator will still work as normal when you tow a trailer with normal bulbs (or LEDs with resistors)

    cheers, Mick
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