Hello
I have an old car with an alternator with no wiring provision for a charge warning light. I thought that maybe the circuit below would simulate this as I don't want to fit a meter.
![12-volt-battery-l&.jpg 12-volt-battery-l&.jpg](https://www.electro-tech-online.com/data/attachments/34/34320-d74da98341ef33e6af9e117e882f0c39.jpg)
1. Would the 100K variable resistor be OK to set 13.6v.
2. I think I would also need to isolate the circuit from the alternator output using a filter, otherwise the electrical noise from the alternator would kill it. What fillter would I need and where would I place it in the circuit.
Thanks for any help
I have an old car with an alternator with no wiring provision for a charge warning light. I thought that maybe the circuit below would simulate this as I don't want to fit a meter.
![12-volt-battery-l&.jpg 12-volt-battery-l&.jpg](https://www.electro-tech-online.com/data/attachments/34/34320-d74da98341ef33e6af9e117e882f0c39.jpg)
1. Would the 100K variable resistor be OK to set 13.6v.
2. I think I would also need to isolate the circuit from the alternator output using a filter, otherwise the electrical noise from the alternator would kill it. What fillter would I need and where would I place it in the circuit.
Thanks for any help