No interior lights by opening a door or using the interior light switch. Getting 12 volts at the dome light but I guess no ground. Was having some strange switch behavior, open passsenger door and rear windscreen heater comes on and real faint door warning chimes. Replaced the fuse box under the steering wheel and all the peculiar behavior disappeared but still no interior lights. Don't know where the ground is specifically for the interior lights and welcome any other suggestions.