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12 volt DC test one side/ tester lite it's bright other prog lites dim.guestion is switch bad or wiring problem?

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The problem that might be causing your 12 volt DC tester to be dim is due to wiring problem or a missing pin. You need to check the wiring of the tester in order to troubleshoot this problem. You can also try checking the power supply unit for any problem. Contact a technician for more help.

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My husband would know this answer. He uses his tester often. I am answering so I can find you again and direct your question to him. :0)

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what are you testing thats dc? You are talking about switch, switch for what? need more if you want help. thx

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