Technical Cinq alternator light glowing

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Technical Cinq alternator light glowing

Cinq96

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Oct 12, 2022
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newcastle
Hello, 15k mile 1996 Cinq sporting. Was in storage since 2005 & recently put back on the road. The alternator warning light has just started glowing, approx 1/2 as bright as when the engine isn't running. Have checked the wires connecting to the alternator & all looks ok.
Also have checked battery voltage with the engine idling with headlights on & off etc, getting 14.5V.
Am I ok to stay using the car as is?
 

bugsymike

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Jul 2, 2022
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Torbay
Hello, 15k mile 1996 Cinq sporting. Was in storage since 2005 & recently put back on the road. The alternator warning light has just started glowing, approx 1/2 as bright as when the engine isn't running. Have checked the wires connecting to the alternator & all looks ok.
Also have checked battery voltage with the engine idling with headlights on & off etc, getting 14.5V.
Am I ok to stay using the car as is?
Normally if alternator light glowing it is an indicator that the brushes inside are worn out or sticking.
Assuming no other electrical defects.;)
Auto electrician can replace the brushes etc. but they will probably steer you to a new unit :(.
I have replaced brushes on some alternators, so it depends which route you go.
 
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Cinq96

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Thanks for your suggestions. I was thinking that with such low miles the possibility of brushes etc being worn would be low.
From some searching on these forums I see mention of rectifiers & diodes etc causing problems at times. I think I'm probably heading towards removing the alternator & if not easily sorted, sourcing another. I had actually replaced the drive belt while doing the timing belt several weeks back.
Was hoping that with 14.6 v showing that I might be able continue using the car with a slightly glowing charge light for the time being at any rate !
 

bugsymike

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Thanks for your suggestions. I was thinking that with such low miles the possibility of brushes etc being worn would be low.
From some searching on these forums I see mention of rectifiers & diodes etc causing problems at times. I think I'm probably heading towards removing the alternator & if not easily sorted, sourcing another. I had actually replaced the drive belt while doing the timing belt several weeks back.
Was hoping that with 14.6 v showing that I might be able continue using the car with a slightly glowing charge light for the time being at any rate !
Not sure about your specific alternator, some are serviceable with a brush set , some come with a rectifier/diode pack and brush assembly as a unit.
Years ago I bought a Citroen Dyane with a faulty alternator and the brushes from the dealer were only £6 and cured the problem. Some later units have the wires inside electrically welded rather than a screw or push on terminal just to prevent DIY, although they would claim it made it more reliable;)
Generally 13.8 to 14.2 is a good charging voltage , so not far out.
Not suggesting getting violent, but if someone is watching the glowing light as a gentle tap on the alternator is delivered it may show if brushes sticking likely. As you say at 15k not going to be worn , but could easily be sticking so no parts required.
 

rembatt

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Mar 18, 2022
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Trnava
I had the same issue with the alternator light. I reworked the alternator- change regulator, processed contact surfaces, measured all diods and windings. But the alternator light is still glowing. It lasts at least one year. My Cinq 1996 0.9 works correctly. I guess that the reason my be short cirquit in wire connection between alternator-dashboard.
 
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Cinq96

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Just to update, the car didn't get used yesterday at all, this evening/night I was out in it, drove approx 30 miles, parked up a few times including once for 3 1/2 hours. Not once did the charge light glow or light up when the engine was running! Hopefully this will continue!
 

bugsymike

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Jul 2, 2022
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Just to update, the car didn't get used yesterday at all, this evening/night I was out in it, drove approx 30 miles, parked up a few times including once for 3 1/2 hours. Not once did the charge light glow or light up when the engine was running! Hopefully this will continue!
Fingers crossed, though I would say after repairing vehicles since 1969 I have yet to find one that fixed it's self.:)
 
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