PDP 11 gear finally moved

Tail and signaling lights put much more stress on the filament. The headlights are burned steady in practice and will burn out when they burn out. I never replace both, and seldom see any correlation. I just put the spare in the trunk with the kit to get at the lights when they do fail. I figure selling them in pairs makes sense to the marketers since they have seen demand replace both. But I don't mind having them burn out before replacement. Safety would dictate never having to operate the vehicle with failed signals, so it can be justified, I suppose to replace both to minimize that, but there is no way to justify regular replacement of bulbs just because they may fail. To the original discussion, if disassembling and accessing the bulbs is a pain in the ass, as it is for most systems, making sure all lamps are in good condition when the panel is uninstalled (which puts stress on the connectors, fasteners) by checking and replacing any which don't appear to be in good condition makes sense. Jim On 7/22/2015 8:00 AM, Al Kossow wrote: