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You'd be better off digging a pit and standing under it to shoot it. -
The easiest way would to be ignore the oscilloscope, grab a multimeter, and make sure all the main connections are right. An oscilloscope will give 99.9% of even technicians so much grief, as they have no idea what things should even look like on an oscilloscope. Which is also even more likely for someone who's first ever major work on a car is this If the battery volts are dropping down so low, the LDV will reboot the ECU, when it does so, it will drop out the start circuit. If this is occuring, the battery voltage should also come back up. Give it a few tests, even simple ones like when you're attempting to crank it, measure voltage from the engine block, to the negative terminal. You might find you've got really bad connections somewhere. My guess is the "new" motor has something like a shit starter motor, at which point, you can swap the starter motor from the old motor, to the new motor. Before I did any of the above though, I'd 100% confirm the battery in the vehicle. Most jumper packs are absolutely useless, especially if a battery has a bad cell for example. Also the new modern "jump packs" if you don't know what you're doing with them, you won't even get them into high current stage. So go back to basics, check the battery, especially with a known good one as a replacement test. Check ALL the wiring, this includes where they're bolted onto the battery, and bolted onto the starter motor. Check all the earth straps are on. Measure your resistances across your earth straps. A good check here is to measure voltage across the earth straps while you're trying to crank it. If you're seeing voltage, you've got high resistance joints! Oh, and once you've done the above, check the battery over again. -
For most rotisseries, as Duncan has mentioned, you really don't want a full car on it, you want a stripped shell. And imagine how many more weeks THAT is going to add to working on the car...
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