Car only starts with jump start despite full battery?

Car only starts with mobile jump start or external starting. The battery is fully charged to 12.8V. The car is idling but won't start. The car has only been driven twice in the last two years and has been standing still. The spark plugs were changed two years ago. My friend also installed his one-year-old…

How to connect a Mercedes W123 Coupé (built in 1983) correctly – need help?

Hello everyone, I tried to replace the ignition cables on my 1983 Mercedes W123 Coupé. Unfortunately, I was stupid enough to forget to label the cables before replacing them, and now I don't know which ignition cables go where. I'm attaching a picture of the engine compartment and would be very grateful if you could…

How long does cable insulation last before it cracks and crumbles, e.g. in a hot car engine compartment?

The following happened to me during my training in 1992: I was working for an elevator maintenance company, and we were called to the Catholic Radio station in Stuttgart because their elevator, which was about 20 years old, was working on and off. The technician checked everything but found nothing. We were standing in front…

My Fiesta is stubborn for a few minutes and accelerates poorly after it rained overnight. What could be the cause?

Hello, It's a 6-year-old Fiesta (petrol, approx. 60,000 km) and it happens every few days. For example, this morning, after it had rained heavily overnight, I started the engine without any problems. The battery light didn't indicate anything unusual. Then after driving a few hundred meters, when I shifted into fourth gear, it became stubborn…