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Originally Posted by Burg Boxster
It's not just a Porsche scenario. Think about it for a moment...
- the lamps/bulbs were most likely made around the same time
- they were installed in vehicle at same time
- they run at the same time
Whenever I replace bulbs, especially headlight and brake light bulbs, I just do the pair at the same time. Although they don't usually go bad at the exact same time, I find I'm more often than not replacing the opposite side w/in a week or 2. ...  |
Yup!! In addition to both bulbs being in service the same amount of time, as a bulb ages it's resistance increases. This is OK because both bulbs on the same circuit are doing this at the same rate.
But, if you replace only a single bulb in the circuit, this new, fresh bulb has much less resistance and so passes more current to it's opposite causing it, in an already 'depleted' state, to 'work' harder and so the second original bulb blows more easily/quickly.
