wiring harness testing

So i have the tail light harness out of the car. (68 Valiant). I am a novice at electrics but plan on checking every wire and replacing prn. I bought a multimeter and a back probe kit for connectors. Somewhere in a video that I cant find now, someone was using a jump starter as a power source for bench testing the wire ohm readings. Is this safe/sufficient? can I use this same set up to check relay, connectors, and bulbs? I have been trying to do a lot of research before I start, but don't want to muck things up. Any advice would be appreciated.