stock JBL system cutting out

[White'88LSC]

Ok, I just got the stock system working a month ago. Now once in a while when I use either direction signal, or tap the brakes,
the system cuts out the audio instantly on application of the brake or directionl sw.
Now only about once a day maybe, and imeadiately returns when I release brake or return sig stalk??????? Where do I start with an intermitten problem like this. BTW, no fuse problems, and it sounds great when plaaying, tape or tuner!........Ideas??? :confused:

[LincoConti87]

I had a funny situation that occurs every once in a while that reminds me of this. I have all aftermarket, kenwood deck, polk speakers. Anyways It seemed to happen if I turned up the volume to 25 or higher for a day or two and then it would start intermitantly turning off and coming back on alot. I would check the fuses and they all looked ok but one of the 15 amp blue fuses that is part of the radio wiring was in fact going half way to where it would not break but it would screw it up like so. I changed the fuse and the problem would go away for awhile. Its happened at least twice. I'd try changing the radio fuses just for the hell of it.