Hi , I am Tech Michael an expert in this field and I will be assisting you today. I am a Master Technician that's dedicated to giving you the best Answer possible.
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I am not sure which meter you have, may I have the model # of your meter?
Also what wires are you testing?
What you need to know is which is ground and which is positive or you could damage the radio you are trying to install.
Two wires require power on your radio, one is live always, the other is switched with the key.
The live one that isn't switched off with the key, is for your station memory;-)
In any case, I will stick with you until this is complete.
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