Ask a Mechanic Online and Get Answers to Your Car Questions
Well to start you know the battery is bad. Get a new one and stop with the jumping. Check the alternator output when it is running. Check each fuse with a DMM or at least a test light. Each circuit that doesn't work needs to be treated individually. Checking for power to each component. Going to be a slow tedious process.
Yes 24 volts is bad but the circuits are protected. Good luck.
Are you trying to reach me? Can you respond to this?