Registration and Posting Agreement
Related to but not exactly the same... My 1985 C20 every once in a while will blow out the horn fuse. That effected the dome light but not the light under the dash. The cigarette lighter was effected because the radar detector would go on and off when the door switch activated the dome lights. Somehow they were all effected and if your power to the aftermarket radio was taken from the cigarette lighter circuit that may be what is happening. As long as the fuse is good and the horn works everything else is fine. My $.02