The empty socket may be for optional functions-like steering wheel
switches for radio operation, etc. Do not attempt to power up those
terminals. The memory power is probably missing on one of the other
plugs. You should test (not just look at) the fuses in the fuse panel,
and obtain a wiring diagram for the vehicle; possibly a partial one for
the dash circuits. Find the missing KEY OFF supply and restore it.
JR

Mr. Transistor wrote:
I've googled this to death but thought I would give this one last try here.



I have a 1996 S10 Blazer with Delco radio model #16169165. I can see that
the previous owner must have installed a different stereo & then when they
traded it in, replaced the Delco.



I bought the car a month ago and its fine except the radio memory does not
store any station setting or time. It has three plugs- black, blue, and
white. An orange wire in the black plug supplies 12 volts while the key is
in the ignition. There are no other voltages present in any plug with the
key off.



With those 3 plugs in the back of the radio there is still one open socket
with 7 pins I believe. But there are no other loose cables anywhere to be
found in the dash. Is the 12 volts necessary to keep the memory supposed to
be through this plug?



Unless someone has any ideas, my only hope is to apply 12 volts to each of
those pins to see if the memory keeps without frying the radio.



Someone suggested that the radio might have an internal battery, but I've
taken the covers off and don't see anything resembling a battery.



If you have any ideas please let me know!



TIA, Steve




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