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There is no fuse box, they use inline fuses. Chase the wiring back to the battery, somewhere near the battery or the radio/fish finder will be a fuse on the power wire.
There are many possible reasons. Few pointers.
Disconnect antenna and check for static. If it is still there then turn off everything on boat , including battery charger and check for static. If is gone then start turning on electrical devices to narrow what is causing electromagnetic interferencw. If your still have static then disconnect all speakers right on stereo harness. Start connecting speaker to individual output to check for static. If there is no static then one of speaker wire installed on boat is shorted somewhere. If you have static when connecting speaker straight to stereo harness then likely internal ampflier inside stereo is a problem
That model is meant for marine (boat) use. You can pre-test it anywhere as long as you are providing the proper power source. It's meant for 12vdc. If you have a marine battery, or a car battery handy, just power it up from that. You do not want to plug it in to household current, you would fry it in a matter of seconds. I would suggest hooking it up to the power 12v outlet in your car of truck to test it.
The trick is find the adapter which plugs into the original radio's harness. In the automotive world, these adapters are vehicle specific and readily available. The adapter plugs into the original radio's harness and the wires on the adapter are the same colors as the wire colors on the new after market radio's plug. So it's a matter of connecting yellow to yellow ,etc.
I was unable to locate adapters for boat radios, or radio pin outs . I would think they are available as the automotive adapters are.
I suggest you go to a local marine supply store and ask if they carry radio adapters for after market radios. You can also try doing a web search. It may work if you can come up with the name and model number of the original radio in the boat, and try a search using that info....
Disconnect all the speaker leads and then hook one speaker (a new, known to work speaker) up directly to the radio using a short (6"-12") piece of speaker wire. Does that speaker work then?
Contact http://rcfishingworld.com they have parts for that boat It doesn't matter if you bought it from them or not, they are pretty cool about that sort of thing. You might also try searching on google, yahoo, or bing for the parts for model # ep-777
That is most likely because the radio is drawing more power than the wire can provide. First make sure you have good connections, especially a good clean ground. Next make sure the power wire from the boat is at least the same size or thickness as the power wire on the radio. If that doesnt work, you may want to wire the radio directly to the battery, using an aftermarket inline fuse and wire available at any car audio store.
Your radio with model number M33GMC09C2AA is a GM300 made for Central Asia, Eastern Europe and Turkey. It is VHF 25 watt with 12.5 channel spacing. It will do frequencies between 146-174 MHz. It should be able to be "read out" by a Motorola dealer. If it has been in a boat, it most likely is programmed with Marine frequencies. If you have another marine radio you may be able to determine the frequency by process of elimination.
The wiring kit for power is readily available for around $18 ea. If your boat has a marine VHF antenna onboard, you will be able to attach the antenna to this radio. It takes a mini-PL connector.
If you are using the radio on a boat, then no, the grounding does not matter that much. However, an SSB transceiver would be hassle to install on a boat because of the amount of power they use to transmit. If the transmission is bad, try using the radio's internal tuner instead of the separate tuner. This may help improve the quality of transmit, however, some radios have a tough time clarifying incoming and outgoing signals and create a garbled sound when it receives a signal or when it transmits. If that doesn't work, then you can try grounding. But if you want a radio that doesn't require all this nonsense tning, you might want to think about investing in a Yaesu. They are pricey, but are one of the best HAM radios.
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