Why does the door light time and radio not workreset when you open the front left door or start the car?

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Light, Door and Radio Elec. Probs.

Trace wire from front left door to fuse box. It has probably been earthed to another location when installing the radio. It should trace back to the same place as the other doors. When you have your car on, your electrical circuits change from battery to ignition (alternator) power. Find the common connection for your doors interior lights and radio, make sure each one's positive leads is connected to the battery via a fuse or relay/fuse.

Sounds complex, but once you get into it, it will be obvious.

A test light is a very useful tool for autoeclectrical work, they are cheap and easy to use. Consider getting one for this job, if you havn't already got one.

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Your radio doesn't go off when the car is off and you open the door?