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A friend has a problem with the brake light on his car which is causing interference with the indicator lights. On checking I discovered a transfer of solder from one of the contacts on the brake bulb to the contact surface on the lampholder which is causing a poor circuit. I recall reading, many years ago, about the reasons for this transfer, but memory fails me. Can anyone refresh my memory?
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It's what's known as a high resistant joint. Connection gets hot because of a poor connection and melts the solder. Most faults in rear light clusters can be traced to a poor earth. If the main earth is poor or disconnected the power will use an alternate route, namely through another bulb that isn't being used, and in turn will make that bulb glow dimly.
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