before condemning the battery and alternator as steve2286 said DVM. you could have loose or broken wire's to the alternator loose or badly corrode battery connector's ,badly corroded earth connection so look for corrosion on the cable crimps...
If you are interested, I can go and measure the dimensions (although mine is a 2001 FL1 Td4, not a facelift so maybe the centre console etc is not the same, so dimensions you would need wouldn’t be exactly same?) Not rocket science tho.
they are in PNG format and rendered with MS paint so the colours do not bleed into each other unlike other formats so if you down load them and open with MS paint and zoom they should stay as is
no run out checks before or after the machining and a locking bolt drilled through the crank journal and then skimmed sheer skill :( let hope the crank shaft bearing regrind is as precise. love the health and safety sandals and loose clothing...
not a fan of that size of jubilee clamp prefer the two wire type the jubilee clamps tend to distort the rubber hoses you can get smaller thinner jubilees that would fit better or the correct sized modern spring tensioned clamps ,be careful when...
You can't use the temperature gauge for anything useful.
For one thing - they ONLY works if the engine is full of coolant - once the sensor isn't IN coolant, it move change anyway... That goes for all cars.
You might also need a better mechanic...