I can't help with the latches problem, but I might be able to help with the electrical problem.
About the tongue jack – Are you sure it's not due to your dead electrical system? You can always try jumping some power to the jack directly from your truck/car battery and see if it works. If it does work and if you have power in the trailer, look for a blown fuse.
About the dead electrical system: Start at the start, the battery. Does it register about 12.5 volts or more? If not, try to charge it. You can usually take it to an auto parts store and they'll test it for free. You can even jumper your truck/car battery to the trailer for a short time.
Once you're sure the battery is in good shape, start testing the electrical appliances. Do they work? If not, start checking fuses.
Once you have the lights and things working, you need to see why the battery went dead. Did it not get charged? Plug in your trailer. The battery voltage should jump up to about 13.5 volts while charging. If you don't see the voltage go up, you'll need to look at your converter. Maybe a circuit breaker or fuse is tripped.
Good Luck!
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2003 Hi-Lo 2703 Classic
2002 Avalanche 2500
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