Using Ham Radio Power Supply?

I have a ham radio power supply that puts out 13.2 volts. It also has a cigarette lighter receptacle that puts out 5 volts. Can I use it as a power supply ? 13.2V seems too high, 5V seems too low. I also have a 9V 1.7 amp power supply but the polarity is backwards. I would have to build an adapter to convert it to center positive and the parts to do so would cost about the same as getting a brand new 9V power supply with the correct polarity (female plug $15 at Fry's Electronics). My eventual goal is to power the Arduino board and a few motors. Thanks!

Check the 5V output with a multimeter on DC volts - should read 5V and AC volts - should read zero. If this isn't the case it isn't regulated so do not connect to Vcc.

You may want to check what voltage motors you are going to use...

If 13.2V is too high for the Arduino (because you are powering other stuff at 5V via its regulator), then try and find a linear voltage regulator intermediate in voltage (a 7808?) or a 12V->5V DC->DC converter - the latter wastes less power/heat.

USB chargers are a handy source of regulated 5V, or a powered USB hub...