Interior Light Problem on 1999 Solara

[mfox20]

I have a interior light and clock issue that began a couple of days ago. I will describe the issue below and what I have checked so far. Any input would be appreciated.

1. Open any door, dome light does not come on and the clock goes out then resets to 1:00.

2. Turn on any inside light switch such as the map light or vanity mirror light, no lights will come on and clock goes out then resets to 1:00.

3. Open trunk, same symtoms as in 1 and 2.

It appears that 12 volts becomes not available to these items when any light switch changes position (door switch, map light switch, etc...). I checked voltage in the passenger side vanity mirror and showed about 9 volts only.

Battery voltage is about 12.6 and alternator is delivering about 14 volts. I am not seeing any battery drain down overnight.

Bulbs were checked for continuity and appear to be good.

I am not sure where else to look, maybe I missed a bad bulb, bad switch, bad ground. Everything appears to be related to the courtesy type lights.

Any thoughts?

Again, I appreciate any insight you might provide. We purchased the car new in 99 and it has about 131k and has had very few issues.

Michael