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Where does the 12V (13.8V) come from?

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In Reply to: 12V DC power supply voltage too high posted by mc1b on September 3, 2006 at 09:40:21:

That designation normally indicated it is designed to charge or replace a 12v car-type batery (eg for a Ham radio).
13.8V is the voltage required to charge a battery.
You may find that without a load it will go to a higher voltage. Connect a 12V car bulb across it and see what you get. If it is still high, then something is blown, possibly the regulator, but impossible to say without measuring things.

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