If that funky looking junction box is about 6" x 8", that is the transfer switch between shore power and generator power.
As to the numbers:
The top line indicates that it uses standard 120 volt 60Hz (likely a typo 6Hz) AC current with a maximum line draw of 14.5 amps. This is 1740 watts maximum draw on your generator or shore power.
The next line, although strangely worded, appears to indicate that it will settle to 7.5 amps charge rate over time as the battery recharges. This is high for a constant charge level or float these days and is the reason that it would eventually boil your batteries.
The last line indicates that at 12.0 volts DC, the maximum amperage flowing to the batteries is 75 amps or 900 watts. Today, most chargers would be rated at 13.4-13.6 volts DC with a maximum charging voltage in excess of 14 volts but this is listed at the old 'nominal voltage' rather than the actual operating voltage which would have to be at least 12.8 volts to actual raise the potential high enough to charge the battery.
At maximum output, this charger uses approximately half of its input power (wattage) to drive the output and the remainder is given off in heat.
Installation is difficult primarily due to limited space, at least in my coach. The red wire is the positive lead, the white wire is the negative lead and the AC cord plugs into the electrical outlet in the bay. Make sure that it is unplugged and the batteries disconnected before removing the red and white (or black on most newer converters) leads since they will be otherwise still capable of delivering the full potential of the battery bank.
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