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Hmmmmm, well that`s unfortunate , i can tell you that most electronic devices that connect to low voltage DC supply's are protected bye a protection diode and the fuse link you think it might be is a circuit trace internal. an 800 watt innverter draws about 80 to 100 amp to produce the 800 watt output and you must have 2 40 amp fuses or 3 30 amp fuses customer replaceable, if you did not damage the components in your device all you kneed to do is to repair the circuit trace and replace the reverse polarity protection diode to restore normal operation
there are no fuse links internal to inverter power supply's
If you are lucky, you may have blown the fuse. It is located on the back panel, usually in a little plastic slide out holder, but it can be sometimes found in a tubular container which has a knurled plastic cap.
I have had this same problem with several power inverters over time. The problem is usually one of three things.
Those starting with the simplest.
1. Too much current being drawn on the inverter.
Solution (Check appliances that are plugged in and make sure they are not drawing more than 1200 watts. If they are unplug the appliance that is using the most current and get an inverter that is more suited to your power needs.)
2. Some power inverters have fuses built on to them. Sometimes multiple fuses. Sometimes, one fuse may burn out leaving one intact. When this happens even small items draw too much current and over load the inverter.
Solution (Replace the fuses)
3. Improper installation. Inverters draw a lot of current. You must use the propper wire size for the inverter. I would recomend at least an eight guage wire directly fused and hooked directly to the battery. Of course like with all things the bigger the wire the better the flow of electricity.
If it is not one of those things stop into a truck stop electronics shop and have the person diagnose it.