so I try to follow the wire, starting with the cable connect to the plus side on the batteries, it's leading under the car and connection to an intersection, there are 5 cables, 1 coming form the batteries 1 going to the starter, 1 going to some sort of plug inside the cabin, a small one going...

After disconnecting I got 24.9 volt

I do have 2 new batteries and a multi meter but I'm lost to where to test, i already tried on some of the electrical but noting cause a short

Me and my dad are trying to restore a series 3 109, ex-Dutch military 24v. When we bought it, it was running, not great but running, a lot needs to be done, we did the break but now the car won't start and it's causing the battery to spark. I tested it and I got a short when turning the key. I'm...