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Hi my name is Robert...
Near the entry door do you have a battery disconnect switch?
Are the batteries 6 or 12 volt?
The 6 volt batteries will be for the interior. Below is a link for you that will show the hook up, it shows both the 12 volt and 6 volt set up. When the disconnect switch is on you should have voltage through the disconnect switch on each cable, if you have 12 volts you know the batteries are hooked up correctly. Follow the cable to the house battery fuse box and make sure you do not have a breaker tripped, below is a picture for that..... Sometimes you will find a disconnect switch inside, it would be near the step switch OR above in a cabinet OR on the monitor. The inside switch would trigger a solenoid. The best plan on this would be to get a 12 volt test light and probe for power if the batteries are hooked up correctly, the test light will allow you to probe the battery cable, fuses and breakers to see where power is missing.... Robert