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Yep, I bought one off of eBay for 60-70 bucks... It was invaluable while wiring the T bird .
It has 20' long leads, will detect shorts, actuate relays... I feel dumb for not buying one earlier.
This is the one I bought... I was wrong it was $78.
It's a test light that detects 12v power, can send 12v power, detects shorts/grounds and checks resistance. It onnects to your battery, or power outlet.
If you have any basic automotive electrical knowledge, it makes things so much easier to trouble shoot...Probably on of my favorite tools.