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Author Topic: Charging light  (Read 1928 times)

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barkingwilhelmina

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Charging light
« on: March 22, 2011, 10:57:42 PM »
Hi all. Have just got my car back on the road after a rebuild, along with a new alternator, and now the charging light goes off when you start the engine, but comes back on again when you increase revs/drive the car....? I haven't had a look at it all yet as have only just got the car home, but would anyone know why this is happening.....
o, it's an 1980 de ville 652cc by the way
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UnaBellaDonna

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Re: Charging light
« Reply #1 on: March 23, 2011, 06:46:59 AM »
Does it come on to full brightness the same as when the ignition has just been turned on?
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drwheetos

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Re: Charging light
« Reply #2 on: March 23, 2011, 06:55:10 AM »
I just had a very similar problem.

Check your wiring from the alternator.  If all your contacts are clean and there is no breakdown in the wiring itself I'd say its your alternator playing up.  You can use a multimeter to check its output, hold the + lead on the output terminal of the alternator and the negative on ground (The alternator body should do).  If the multimeter reads below about 12.6 v when your engine is running (at fast idle) your alternator is at fault.

Some other people on here may beable to tell you if its the voltage regulator or the diode pack thats playing up but I changed the alternator for good measure and it cured my problem!
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barkingwilhelmina

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Re: Charging light
« Reply #3 on: March 23, 2011, 07:12:06 PM »
No the light seems to be quite dim and slightly flickering?

I will get a volt meter and test it. The alternator is new though.....
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hotdeffender

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Re: Charging light
« Reply #4 on: March 27, 2011, 10:34:31 PM »
My evil deville restoration project has now decided that it too wants to play the dodgy charging light game.  >:(

Symptons, come on with ignition, goes off at idle, comes on again as it should if you lower the idle speed to much, but also comes back on at higher revs which obviously it shouldnt.

Alternator is putting out over 12 volts at a decent idle and over 13 volts when revved and with the light coming on.

So its generating enough power, but cant understand why the light should start coming on at high revs.

Any ideas?
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barkingwilhelmina

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Re: Charging light
« Reply #5 on: May 07, 2011, 09:03:08 PM »
right finally got to the bottom of it, didn't connect the brown wire from the alternator to the starter.....err derrr! still it could happen to anyone! (i keep telling myself that)

now to sort the juddering changing from 3rd down to 2nd....?

you sorted yours yet hotdeffender....?
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