I got my original 1970 c10 GM AM radio reconditioned the other day and I hooked it up with the speaker and antenna with no problem started working just fine so then I notice I forgot to put the mounting bracket on the back of the radio and bolt it up so I took out my radio and put the bracket on with the screws and hooked everything back up and nothing..... I have power to the radio because the light bulb is on in the radio so I know its getting power but, no sound at all. Can somebody please help me fix this problem????