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Dear friends, thank you for all your kind help.
How to know wire polarity in an open circuit without any electrical power? E.g. you have a dashcam with 2 wires with same color insulation. How do you know which is positive and which is negative?
If you plug wires wrongly into the battery, a short circuit may happen and damage the dashcam.
How to test for wire polarity in this open circuit then?
Thank you very much
I have followed these post and chimed in to confirm my understanding without breaking out the meter.
Using the ohm scale on the VOM, is it not reasonable to determine polarity by measuring each dash camera lead to ground in order to determine polarity. I assuming the -ve connection is tied to gnd. Using the ground plane of the dash camera as the -ve polarity not acceptable?
