How to test my radio?
 

I picked up a am/fm radio and I wanna test it without installing it. But I have a few questions.

There is a female plug on the back side. It looks like 3 prongs. I assume one is power, one is L speaker and one is R speaker wires. Am I right and if so, which one is which?

Also, aside from hooking up a speaker...can I just run a wire from my positive battery post to the radio power plug to test it? Do I need to ground the radio to the frame or anything?

Thanks.

Re: How to test my radio?
 

any 12v electrical unit needs a hot wire and a ground to complete the flow of electricity

Re: How to test my radio?
 

Thats what I thought. Thanks.

Re: How to test my radio?
 

Chime in if I'm wrong, but don't those old OEM radios require a 10 ohm speaker? IIRC the output transister is germanium which can't handle the current output that a 4 ohm speaker will draw.

Re: How to test my radio?
 

8 ohm speaker is stock

Re: How to test my radio?
 

Still need help on the plug....

Re: How to test my radio?
 

One is power, one is ground and one is speaker. I'm sorry I can't help you more at the moment. Someone will be along shortly to tell you for sure....

Re: How to test my radio?
 

I believe one is power and the two other would be speaker positive and negative. The radio gets grounded when it is bolted into the dash.

I just need to know which is which.

Re: How to test my radio?
 

This might help:

http://67-72chevytrucks.com/vboard/s...d.php?t=384992

Re: How to test my radio?
 

I think it also stamped on the radio itself

Re: How to test my radio?
 

Looking at the back of the radio. Left to right. Speaker grd, speaker, 12v.

Re: How to test my radio?
 

Thanks fellas!

Re: How to test my radio?
 

According to the shallow stamp on the top of the radio, it says
"DO NOT OPERATE
WITHOUT 8 TO
OHM SPEAKER"

I believe part of the stamp is worn out...