pencilneck
Registered User
Hello, I have a power transformer sitting around with a 1.6 amp output of 12 volts dc. The device was used for some electrical gadget, can't remember what. What I would like to do is to use it as a 12V test device to test automotive components but the output leads are not labeled. So I don't know which is "positive" and which is "negative". Is there a simple electrical test with a multimeter I could do to see which lead should be "negative" so I don't fry out the diodes in the device? I do not have a multimeter with a sweep meter to see which way the needle deflects. I could even use it to charge small batteries manually with its 1.6 amp current. I already tested both sides of the output to the power plug and neither side is continuous with "ground". Thanks, Roy