Electrical short 300-E 1992
 

I have an electrical short on fuse C the red fuse that controls the door locks and rear map light. I thought it was a bulb and replaced it.
I replaced fuse C the red fuse and the door locks worked and the rear map light worked for about 5 seconds. I checked the fuse box and the fuse had blown . I did this twice to confirm my problem.

I am perplexed at what to do. What should I check that could be blowing this fuse? I also lost my radio that has to be sent in for repair. could the radio case the this fuse to blow. It is a factory silver tone Becker.

Sincerely
Bob Geco