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Thread: No reversing lights still.Ford AU2

  1. #21
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    Quote Originally Posted by SS Dave View Post
    15 amp seems large for reverse lights only. 2x21watt lamps + 100% margin is around 7 amp
    I would have thought the same, but the genuine Ford AU Workshop Manual does indeed specify 15A for reverse lamps.



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    The Alternator light wont go out until the engine is running at speed. The most common cause for the light to come on with the engine running is it is too slow or a slipping belt.
    Even though its a serpentine belt, it doesnt hurt to check the tensioner is doing its job and the pully on the alternator is tight and the belt is not worn.
    If however your Alternator light is coming on when your driving could indicate a there is a problem in the alternator.
    I dont know how Ford wire there Alternators but I have had 2 fail without warning on this wagon.
    The first time it happened was when I was driving in daylight with the Radio on and when I used the Indicators, the Radio went off !!!
    Everything appeared normal some 20 minutes earlier when I started the car to go shopping.

    Idle ranges between 500 to 700 RPM depending Auto/Manual/ XR6 etc.
    According to the workshop manual, Fuse number 2 for the Reversing Lights is indeed 15 AMP.
    I stand unequivicably behind everything I say , I just dont ever remember saying it !!

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    Nothing worse than an intermittent fault.

    You might want to try the old trick of replacing the fuse with a 12v globe of at least the same wattage as the reverse lights. In normal use, the globe and reverse lights will light at reduced brightness. When the fault is present, the test globe will illuminate at full brightness - limiting current to a safe value, but helping with fault finding. You'll then know if the fault is just a momentary thing or if a certain sequence of events produces a "hard" fault.

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    Quote Originally Posted by shred View Post
    Nothing worse than an intermittent fault.

    You might want to try the old trick of replacing the fuse with a 12v globe of at least the same wattage as the reverse lights. In normal use, the globe and reverse lights will light at reduced brightness. When the fault is present, the test globe will illuminate at full brightness - limiting current to a safe value, but helping with fault finding. You'll then know if the fault is just a momentary thing or if a certain sequence of events produces a "hard" fault.
    A smart diagnostic tool

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    here is a pic of the one i made

    the globe is a eye level brake light one and a blown fuse i have had this one for years.
    Death smiles at everyone. Grumpy old men smile back.

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  • #26
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    Bluddy Brilliant idea, Why didn't I think of that one!!!!!!!
    I'm out of my mind, but feel free to leave a message...

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    As a last resort, remove both globes and go for a drive and see what happens.
    I would avoid using Reverse while the globes are out.
    I stand unequivicably behind everything I say , I just dont ever remember saying it !!

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    Ive encountered this before, remove a globe at a time to see if the fuse pops, if it doesnt then the globe removed has a faulty element resulting in a short

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    The STOP globe in the top of the wagon door failed but never blew the Fuse or affected the other Globes from working normally BUT what it did do was interfered with the operation of the Cruise Control.
    It wouldnt set or if it did, it would 'drop out', turn any lights on and it might work or if I had already got Cruise set, it would drop out.

    The globe was black so I couldnt see inside it.

    Globe changed, Lamp works and did Cruise Control and hasnt missed a beat since.
    I stand unequivicably behind everything I say , I just dont ever remember saying it !!

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    Quote Originally Posted by mtv View Post
    Does that mean you've visually checked the entire wiring harness from front to back?
    Yes I have. Removed the rear seat, the mouldings over the door sills, tho not where it goes into a a larger loom

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    Being the reversing light, there should be NO Power in the line UNLESS your in Reverse !!!
    With the Gear Lever ( or switch) in any position other than Reverse, (ignition ON) you should be able to bare and connect the reverse wire to the metal chassis of the car and have NOTHING happen !!!
    I wouldnt try it however just in case the damned computer does send some kind of a signal through the wiring.

    I am sure Ford use the Positive to Fuse/Switch to Device (light) to Earth unlike one Jap car that ran the Positive to the devise (light) Fuse, Switch then Earth.
    Last edited by gordon_s1942; 30-01-18 at 11:53 AM.
    I stand unequivicably behind everything I say , I just dont ever remember saying it !!

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    Default Reversing lights still not working fix!!

    At last the frigging problem fixed by having to replace exhaust mounting rubbers.
    Had replaced 12 months ago & they fitted the rear mounting with the wiring loom close to the rear muffler. Eventually the heat melted the outer then the bare wire touching the muffler when on the road.
    Cheers & to all who posted assistance Thank you.

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  • #33
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    I moved your 'fixed' thread here, as it's best to end the story here, rather than start a separate thread about it.

    Pleased you finally got it sorted.

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    Seee? WEEEE told you it was in the Loom (SOMEWHERE!!!
    This would have exceedingly annoyed me for paying someone to do a job and having that happen.
    On an old XB Falcon sedan that had been fitted with an 'after market' A/C, it stopped working and it was found the hose coming from the bottom of the AC unit up the side of the engine was run very close to the exhaust pipe and manifold and as a result it perished and burst.
    When I had it replaced, I made sure it was well clear of the pipe and wrapped something around the hose to act as a heat shield.
    Six inches of extra hose was all that was needed to be clear of the exhaust and would have saved me having to replace the hose, 2 fittings, Drier, re-gassing and labour.
    The first car I bought with factory fitted A/C, that was one of the things I checked before buying it (2nd hand)
    I stand unequivicably behind everything I say , I just dont ever remember saying it !!

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