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Alternator Problem


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#1 Budgie650

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Posted 24 January 2010 - 08:39 PM

On my 52 plate Ka when the headlights are on they start at normal brightness and go brighter then go to normal brightness,I have placed a multimeter on the battery with the engine off,it reads 12volts so battery ok,if I start the engine with multimeter still connected to the battery I get a fluctuating reading between 13.4volts and 15.4volts,I do not get a constant voltage,it seems to me the voltage regulator on the alternator seems to be not working.

My Query is can the regulator be renewed on a modern alternator,in my younger days i renewed a regulator in a Lucas alternator on a Mk2 Escort.

Also how do you identify which model of alternator is fitted without removing it,if I have to replace the alternator.

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#2 nickdando

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Posted 25 January 2010 - 08:00 AM

On my 52 plate Ka when the headlights are on they start at normal brightness and go brighter then go to normal brightness,I have placed a multimeter on the battery with the engine off,it reads 12volts so battery ok,if I start the engine with multimeter still connected to the battery I get a fluctuating reading between 13.4volts and 15.4volts,I do not get a constant voltage,it seems to me the voltage regulator on the alternator seems to be not working.

My Query is can the regulator be renewed on a modern alternator,in my younger days i renewed a regulator in a Lucas alternator on a Mk2 Escort.

Also how do you identify which model of alternator is fitted without removing it,if I have to replace the alternator.


I'm not an electrical expert, but those figures seem to be normal to me. I've had the "problem" of fluctuating headlight power on my last three cars (Skoda Octavia, VW polo, and now StreetKa). Due to the load on the electrical system, due to a number of factors such as current draw when driving on snow with the front and rear demisters on, windscren wipers, air-con and recirlculation on and a heated seat (on the StretKa), the headlight power rises and falls with the numbers of revs the engine is producing. With the VW-based cars, I would also get a click from a relay as power was transferred from one part of the circuit to another as the revs rose above (or dropped below) a certain point. Then I'd get full power for the headlights.

With the recent snow, the amount of drain on the battery will have been high as I struggled home the eight miles across country at less than 30 mph in as high a gear as possible, whilst trying to keep myself warm by having a lot of electrical gadgets on. With the battery being much less powerful on the SK than the diesel VWs, I may have to consider wiring on a trickle-charger lead, as I used to do on my recently-departed motorbike, to stop the alarm draining the battery.

Nick

#3 Budgie650

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Posted 26 January 2010 - 07:47 PM

I'm not an electrical expert, but those figures seem to be normal to me. I've had the "problem" of fluctuating headlight power on my last three cars (Skoda Octavia, VW polo, and now StreetKa). Due to the load on the electrical system, due to a number of factors such as current draw when driving on snow with the front and rear demisters on, windscren wipers, air-con and recirlculation on and a heated seat (on the StretKa), the headlight power rises and falls with the numbers of revs the engine is producing. With the VW-based cars, I would also get a click from a relay as power was transferred from one part of the circuit to another as the revs rose above (or dropped below) a certain point. Then I'd get full power for the headlights.

With the recent snow, the amount of drain on the battery will have been high as I struggled home the eight miles across country at less than 30 mph in as high a gear as possible, whilst trying to keep myself warm by having a lot of electrical gadgets on. With the battery being much less powerful on the SK than the diesel VWs, I may have to consider wiring on a trickle-charger lead, as I used to do on my recently-departed motorbike, to stop the alarm draining the battery.

Nick


Nick
This is happening with engine ticking over with or without all electrical items on,It does it any engine RPM


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