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Re: the car radio on my 88 mercury sometimes surges to a...
The oe radiop is not worth repairing. It would cost $200-300... or yu can go to walmart and buy a brand new cd player for around $100.,.,. wiring adapter $20.. so for $120ish you have a modern stwereo that plays cds, and sounds 1000% better than that stock piece of krapola.
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It could be your wiring as well. Sometimes, when speaker wire gets cut and grounded, like your factory wiring to your door speakers or you tap into facrotry speaker wires to add more, the load on your deck increases. When the volume gets to a certain level, it will cut off because of the heat produced to maintain the load.
the radio has to be replaced or sent out to get fixed. there is no easy fix to this problem.the knob is shot. (sometimes you can get the vol to move if you wiggle and push and play with the knob)You are better off replacing the radio with a nice aftermarket one.
Have you tried another speaker? If your left front speaker is in the door as in most cars, it gets banged around a lot. The driver's door gets the most use. This sometimes results in mechanical problems with the speaker, and can cause low sound or distortion. Take the speaker cover off (it may be necessary to remove the door panel in a factory installation), disconnect the speaker and hook another in its place. If the volume is back to normal you know it's the speaker. If not, check the radio and speaker wiring. If the radio itself is at fault because the amplifier is bad, it can be repaired at a service shop. The repair charges might be close to replacement cost these days, so you might consider a new radio if the estimate is high.
a few things...your speakers may not be a perfect match for the unit.
at high volume where the radio starts to distort there is an internal protection circuit that protects the radio...it's kicking in.
solution. Buy a power amp and take the load off of the radio.