[tucsonjwt]

It depends on what you are looking for. Your best bet is to bring a full set of tools and leave it in your vehicle outside. Once you find what you want, go back and get the specific tools you need and put them in a small canvas tote bag.

If you want to find out if an electrical component works, use that 18V battery from a cordless drill. Get two pieces of household romex wire 12 ga or 14 ga) and shove the wire into the contacts of the battery. Use two alligator clips and some small stranded wire to connect to those wire pieces, and connect the other ends of the stranded wire to the contacts on the electrical device (you can use two more alligator clips for that also.) You can use the alligator clip and wire from a couple of 12V continuity testers to simplify the process.

You should really consider what you need first, then go hunting.