PDP 11 gear finally moved

[jwsmobile]

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:
>
>
> On 7/22/15 7:43 AM, Tothwolf wrote:
>>
>> I can't say I've previously heard of that being done with automotive 
>> bulbs
> Then why are tail light bulbs sold in pairs?
>
> I just had one go, and replaced both sides.
>
>
>