20-04-2023, 07:48 PM
Hi Richard
The short answer is that interference can be both conducted (directly along wires) and radiated (travels through space from one wire and is then picked up by another).
The most effective first step that I have found for stopping odd electrical effects in an Austin 7 is to fit resistive suppressors to the HT leads at the top of the spark plugs. A value of 5000 to 10000 ohms is typical. Without suppression, very high levels of electrical noise are radiated by the ignition system, which will get into all the other wiring of the car.
A capacitor from live to ground at the input to the flasher unit is also worth trying. A typical value would be between 0.1 and 1 microfarad - it's not overly critical. This component effectively shorts to ground any rapid fluctuations, while not affecting steady direct current. Another on the warning light wire might be called for. Mount these components next to the flasher and keep the lead lengths short, say no more than a couple of inches.
The short answer is that interference can be both conducted (directly along wires) and radiated (travels through space from one wire and is then picked up by another).
The most effective first step that I have found for stopping odd electrical effects in an Austin 7 is to fit resistive suppressors to the HT leads at the top of the spark plugs. A value of 5000 to 10000 ohms is typical. Without suppression, very high levels of electrical noise are radiated by the ignition system, which will get into all the other wiring of the car.
A capacitor from live to ground at the input to the flasher unit is also worth trying. A typical value would be between 0.1 and 1 microfarad - it's not overly critical. This component effectively shorts to ground any rapid fluctuations, while not affecting steady direct current. Another on the warning light wire might be called for. Mount these components next to the flasher and keep the lead lengths short, say no more than a couple of inches.