07-01-2019, 10:01 AM
I use the isolator switch as a safety & security issue, wouldn't want the car to set the garage and house on fire. I have occasionally operated the isolator before switching the engine off and the engine stops because at it's low idle speed the dynamo isn't generating sufficient to close the cut out. I was asked to help sort out a sports model where an auto electrician had replaced the Lucas PLC switch with the result that the engine wouldn't stop on operating the ignition switch because the dynamo was feeding the ignition. It took a while to sort out because all the wires were black.