Here is an effective 12V Test Light Jig for testing continuity on switch contacts and connections, which will place a 3 Amp load on what is being tested. You can connect to a battery with bolts or alligator clips. Bear in mind, the battery has to be fully charged. Disregarding the battery, one can make this jig for around $10.00.
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Roland Bedell
CC Models: 100, 105, 1450, 782, (2) 784, & 2072
Buy: Made in the USA 