ignition light does not go out

No, the light switches off because 12v (14,4v) is feeding the bulb from the regulator side B/BK wire as soon as your Alternator is charging. Hence the charge light is fed with equal voltage on both sides and that is why it is not illuminating when your Alternator and regulator works (charging)

the B/BK wire will change from minus to plus. (engine off and engine run)


Note, if the bulb is blown the alternator can not energize the field to commence charging UNLESS it has a backup source for 12v, hence the bypass 15 Ohms resistor.


If you are not familiar with auto electric troubleshooting I suggest you talk to a local auto eletric guy. Honestly even many modern car mechanics struggle to fully understand the eletrics and especially on a Pantera where there is nowhere to connect the "diagnose computer"

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BTW If you have this type of regulator I would check it, it is really cheap and easy to change. And since apparently your system is in fact charging (14,4v) then it could be an internal fault in the regulator. Just remember it must be grounded/bolted on to the chassis.

I thought I could color the schematic so that it would explain the write up. But I guess unless you know electronics it gets confussing

as stated, durring cranking, the current needed to "flash" the alternators field goes thru the lamp (and thus it glows)

when the alternator spins and produces voltage, a center tap is used to tell the regulator to switch from "flash" to self substaining. this is relay R2. now the field current makes its round about and there is no current thru the lamp (and thus it is out)

so the regulator is in fact the problem, even though it is "working"

Based on the helpfull comments I checked my engine. I cannot find a regulator which should be located at the backwall of the passenger seat.

My car has a stroked engine with 393 cui which was bought by the last owner in 2009 from the company "D&J Machine & Perfomance engine" in Phoenix,AZ. I have the original invoice of the new engine and the price was 4,895 US$. Since 2009 the car was driven about 3,500 miles.

Because the engine is polished and everything looks like new I suppose that the garage put in a new alternator with an intergrated regulator. Unfortunately the access to the alternator is very limited and so far I refused to open the backwall behind the passenger seat to check it.

So I suppose that the signal from a new alternator is not compatible with the regulator output and so the voltage from the alternator is not switching off the lamp.

In my Jaguar E-type Lucas ignition control light are connected differently. I also switched to a modern alternator. Lucas is using a thermorelais with a pin from ignition (+12V) and a pin from the alternator. When the alternator is not charging the relais is connected to ground. When alternator charges the thermoelement is heated and disconnects the ground.

In the next couple of weeks I need to check my alternator outputs and find a solution.

thanks

has the IGN lamp been on all the time since the new alternator OR did it just happen!

and Yes, the new alternator may have a different method for providing indication

So far I did not have to repair many problems. When I bought the car everything war already installed. The ignition indicator was on since I have it.

Hello Alfred, its is not an ignition indicator (hopefully) it is supposed to be a "no charging" light. Most likely it is just accidently connected to ground at your alternator in stead of to the correct pin. (Varies with different types alternator)