By the way, it was REALLY hard to get out but just keep trying & wiggling it & it will come out but it will solve the problem for the radio, clock & interior lights issue when I changed my dead car battery for my 2005 Kia Spectra!!
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I take it you mean that the radio stops working completely once the headlights are switched on. So if you sit in the car during daylight hours and turn the lights off and on, the radio does the same except the other way round (lights off, radio on). Have I got that right?
It cannot be the fuse because the radio wouldn't work at all if it had blown. The wiring may well be the problem. Something is either shorting or I am thinking that there is not enough power (for whatever reason) to run both lights and radio at the same time, although the battery draw on a radio is relatively low. Is your battery charging correctly? Does it happen if you open all doors and the interior lights operate. Try opening all the doors and turning headlights off and on. Do the interior lights turn off and on like the radio does?
The radio receives power from the 15A AUDIO FUSE in the dash fuse box. The radio memory receives power from the 10A DOME LIGHT FUSE in the same box. The problems you note suggest the radio may have been misconnected at some point or there has been a fuse failure or there is a broken connection.
Are you saying that you had to Jump Start your GMC???
Did you have everything off for 5 minutes while the battery was being charged?
Did the kind helper turn off his vehicle before your tried to start yours.
If your answer is NO to any of the above, you need to read your owner's manual on how to jump start a vehicle...
Now, on to your issue... remove the negative (black) wire from your battery and wait 3 minutes.
Reconnect the cable... everything should now work 0- except your radio station settings will be lost (memory voltage is supplied by the battery and we removed that and cleared ALL the memories in ALL the computer chips...
this is most likely the battery protection relay, this is part of the lighting control module (LCM/GEM), your dealer can test test it but the issue may have been related to the cold, this module controls almost everything except the engine and trans.