Dome light flickers
Are you using a regular bulb or LED. Usually you just need to fiddle with the contacts and get the bulb to seat better in the socket.
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(If your only problem is the bulb.) You either need to clean corrosion off the contacts or bend them in a little more to make better contact with the bulb.
It's not a voltage drop, exactly. The battery voltage is usually just under 13ish volts but the alternator puts out just above 14 volts. A higher voltage jumps gaps in contacts easier than lower voltages.



