[brucepick]

Sounds good to me. Good luck with it!
Make sure you have a voltmeter set up where you can see it.
You don't want to drive + drain the battery to where something quits working.

If you have to, buy some cheapo item that plugs into your cigarette lighter with a cord. Cut the doodad off the cord, now you have a plug that goes into the cigarette lighter. Hook that up to a voltmeter ($10-15 from a big box store) and you can see what your voltage is. Or maybe you have the time to find a nice Volvo voltmeter from a junkyard and install it.

A mechanic friend of mine told me that some components like computers get damaged when voltage drops low, something like 10V. I don't know if he's right on that, but I definitely don't recommend letting voltage sag a whole lot.