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The problem will lie with one or combination of the radio, the antenna or antenna cable. Check the antenna. If it is the type that can be unscrewed from the body of the car, do so. Check and clean any mating surfaces. Dirt & oxidation are enemies of electrical connections. Check the antenna cable everywhere it is exposed. Look for cuts in the jacket which can allow water in and causes oxidation. Check the connection at the radio, too. Make sure it is free of dirt and oxidation too. Clean the connectors and reconnect. Be sure that the plug connections are fully seated in the jacks. If you find a damaged cable or connector, it should be replaced. many times, replacing the cable will be very difficult - you might want to try installing a new antenna and cable instead of trying to reuse the old antenna. These are often available for sale in the automotive sections of department stores, and in automobile specialty stores. Try connecting everything together to make sure it works before punching holes in the body of the car.
The issue may be the radio itself. Try connecting a different radio - either an identical factory radio that is known to be good - or an aftermarket radio to is also known to be good. All of these issues can be a logical point of failure - especially if you purchased the car used. There's no telling how the car's radio and antenna might have been used or abused before you took ownership of the car.
it wouldn't be advised unless there are rca connections into the amp. these are the same as the inputs in the back of the jvc. It is possible to connect into an amplifier using speaker cable but i wouldn;t advise doing this unless you know what your doing.
Hi, KD-LH810 has no option for external input. Refer to the picture attached. It is only front and rear line outputs. Don't get disappointed. Buy the accessory cable KS-U100 and you are set. This info is from the installation manual.