405 electrics!
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Thread: 405 electrics!

  1. #1
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    Default 405 electrics!

    Now that I have a slightly later model road car, 405 series 2 SRi , I seem to be getting the problems other people have talked about with their later models.

    The central locking has a mind of its own, even locked the doors by itself today!

    The main problem at the moment though, is that at the same time the alternator light came on, no problem it is charging fine, the windows work only some of the time and the clock light has gone out.
    Also, the alternator light gets brighter if you put your foot on the brakes, no difference with headlights on and off though.
    Before I start chasing this fault I would like to know if anyone else has had these problems?
    Other than that the car is great, excellent good ride quality.

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    Graham

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    1000+ Posts PeterT's Avatar
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    Quote Originally Posted by GRAHAM WALLIS View Post

    The central locking has a mind of its own, even locked the doors by itself today!

    Graham
    This happened to my son. He was traveling from Sydney to Newcastle and needed to stop for a whiz. So he got out, left the engine running, half way through the whiz, guess what? The car locked itself. What would you do? A passing motorist stopped to lend a hand. Luckily he was a golfer. So the rear LH passenger window got the 7 iron. It was Series 1 car. I still drive it! Your car must have a dodgy door locking solenoid. I'd start disconnecting them one at a time.

    If the alternator light is on then you have charging problems. The light is the only thing between the alternator field circuit and battery +ve. It may just need new brushes etc. but it's definitely not working at full capacity.

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    Thanks Peter, the battery is sitting on 14.3 volts with the lights on, 12.7 with the engine not running but as you say something must be wrong.

    Graham


    Quote Originally Posted by PeterT View Post
    This happened to my son. He was traveling from Sydney to Newcastle and needed to stop for a whiz. So he got out, left the engine running, half way through the whiz, guess what? The car locked itself. What would you do? A passing motorist stopped to lend a hand. Luckily he was a golfer. So the rear LH passenger window got the 7 iron. It was Series 1 car. I still drive it! Your car must have a dodgy door locking solenoid. I'd start disconnecting them one at a time.

    If the alternator light is on then you have charging problems. The light is the only thing between the alternator field circuit and battery +ve. It may just need new brushes etc. but it's definitely not working at full capacity.

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    Isnt there a terminal block on the left hand inner guard ,the positive cable to the inside of the car splits off here i would be looking for a bad connection here or at the battery terminal ,also check the earthing to the engine and body ,sounds like the alternator light is earthing back through the brake light globes ,[ever lost the earth on your trailer conectoin, with some real screwy things happening ]bad earth somewhere or wires worn through and shorting on each other do some poking around for bad connections pugs

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    Had another look, yes, alternator is working perfectly.
    Sometimes the warning light stays off after starting then comes on as revs increase and at the same time the alternator starts to work, due to residue magnetism, seems the exciter connection is faulty.
    Other faults still there, need to chase up a wiring diagram.
    Graham

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    Quote Originally Posted by GRAHAM WALLIS View Post
    Had another look, yes, alternator is working perfectly.
    Sometimes the warning light stays off after starting then comes on as revs increase and at the same time the alternator starts to work, due to residue magnetism, seems the exciter connection is faulty.
    Other faults still there, need to chase up a wiring diagram.
    Graham
    You are describing a classic intermittent field diode fault. If you have a spare "rectifier pack" I'd fit it.

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    Don't know about intermittent everything steady except for the window winders which work on and off.
    Looks like I should change the alternator over and see what I'm left with then.
    Graham

    Quote Originally Posted by robmac View Post
    You are describing a classic intermittent field diode fault. If you have a spare "rectifier pack" I'd fit it.

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    Make sure that you have a good earth between the battery, the engine and the body. We placed extra earths at lots of places on the 1993 model 405 SRi that we had. Also don't forget to remove the rear lefthand tail light and clean up all the earths. I know, but it always helped.
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    May get a chance to take a look tomorrow morning.
    Something else I've noticed is that the window winders never work when I have my foot on the brake!
    Usually but not always OK with foot off brake.
    Graham

    Quote Originally Posted by BIGRR View Post
    Make sure that you have a good earth between the battery, the engine and the body. We placed extra earths at lots of places on the 1993 model 405 SRi that we had. Also don't forget to remove the rear lefthand tail light and clean up all the earths. I know, but it always helped.

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    Quote Originally Posted by BIGRR View Post
    Make sure that you have a good earth between the battery, the engine and the body. We placed extra earths at lots of places on the 1993 model 405 SRi that we had. Also don't forget to remove the rear lefthand tail light and clean up all the earths. I know, but it always helped.
    I've always ran my own earth's in pretty much every 405 I've owned. Makes the lights much brighter!

    There's also an earth behind the kick panels next to where your feet would be. One of mine came lose and took ages to find Why the car was doing so many weird things!
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    Finally found 5 minutes to take a look at it and it turned to be just a blown stop light fuse!
    Still hassles with the central locking though, winding down the window the other day activated the central locking.
    Quite likely still some earthing problem.

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    Quote Originally Posted by PeterT View Post
    This happened to my son. He was traveling from Sydney to Newcastle and needed to stop for a whiz. So he got out, left the engine running, half way through the whiz, guess what? The car locked itself. What would you do?
    Finish the whiz.

    Jo

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