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Car Forum / Volvo Cars / May 2007740 radio problems
My 1991 740 wagon radio isn't working properly. When it's on there's a terrible electronic noise coming from all speakers. The noise is worse when I operate anything electric (power windows or turn signals for example). It never gets better, only worse. Needless to say I don't operate the radio (except to see if miraculously the problem might have stopped). During the winter the area that houses the antenna motor became full of water (drain plug was clogged). This is about the time the problem started, but I can't put my finger on it exactly. I replaced the antenna motor and the problem went away for about two months. Now the problem has returned. Any ideas? I'm thinking a short in the wiring but I have never touched the wiring so don't know how that could have happened. I posted a similar question when this first happened (about three months ago) and someone said there is a fuel relay that works double-duty as fuel relay/"something to do with the radio". Has anyone heard of this? I fos, where'w the fuel relay? Thanks > My 1991 740 wagon radio isn't working properly. When it's on there's a > terrible electronic noise coming from all speakers. The noise is worse when [quoted text clipped - 16 lines] > > Thanks You didn't say if the problem was with AM or FM. This sort of interference is normally worst with AM. The first thing to check is the "earthing" of the antenna to the under side of the boot wing. There's metal fingers that make contact with the car body under the mounting where the antenna goes through the boot. The fact you had water in there could have caused corrosion, so make sure you clean it back to bear metal (put some grease on it to prevent rusting) and then refit the antenna, making sure all the earthing hardware is in place and also clean. A bad connection here almost guarantees noise like you described. regards Barry >> My 1991 740 wagon radio isn't working properly. When it's on there's a >> terrible electronic noise coming from all speakers. The noise is worse [quoted text clipped - 44 lines] > regards > Barry Exactly so. The only thing I'd add is that a break in the shield anywhere will do the same thing. The antenna mounting is the problem at least 90% of the time, but if the radio has been in and out a few times the shield could be broken at the radio connector. The connector should not rotate more than about ten degrees either way under gentle fingertip twisting. Mike fuel relay ,thats under the hood bonnet end > My 1991 740 wagon radio isn't working properly. When it's on there's a > terrible electronic noise coming from all speakers. The noise is worse [quoted text clipped - 20 lines] > > Thanks |
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