On parking my car in the garage at night, I sometimes leave the driver’s door slightly ajar, only to find the next morning that the interior light has drained the battery. Being an older vehicle, it uses incandescent bulbs that consume a lot of power, so I converted the interior roof-light into an LED light.
Buy a subdivisible LED strip (available from most motor spares outlets) and cut it into lengths to fi t inside the light cover, carefully cross-connecting all wires to keep the polarity correct. Solder the outlet leads to the metal parts of a used bulb and attach the LED assembly to the roof-light cover with double-sided tape. No more flat battery!
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