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NB headlight out -- bulb is OK



 
 
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  #1  
Old April 15th 10, 07:03 PM posted to rec.autos.makers.mazda.miata
Grant Edwards[_3_]
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Posts: 68
Default NB headlight out -- bulb is OK

The left headlight is out on my NB, but the bulb is OK. Any clues on
where else to look? Are the L/R headlights fused separately?

--
Grant Edwards grant.b.edwards Yow! FEELINGS are cascading
at over me!!!
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  #2  
Old April 16th 10, 03:42 AM posted to rec.autos.makers.mazda.miata
Christopher Muto
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Posts: 306
Default NB headlight out -- bulb is OK

Grant Edwards wrote:
> The left headlight is out on my NB, but the bulb is OK. Any clues on
> where else to look? Are the L/R headlights fused separately?
>


the headlights are not on separate fuses. i had one of mine lamps stop
working after running 100w bulbs in there a while. even after replacing
the bulbs with good ones (55/60 hella h4) it would do odd things like
one headlight would lit when on dims and neither when on brights. one
of the sockets was slightly deformed (melted) but that didn't seem to be
the problem. i ultimately found that one of the three leads to the
damaged socket had slightly melted about 5 inches down from socket.
perhaps there was a bend in the wire at that point and the excess demand
from the high wattage bulb caused it to fail at that particulr point.
pat happened to have been parting out a car and was kind enough to send
me a replacement socket with some leads (thank you once again pat!). i
was able to back the two good leads out of the original socket and
insert them into the 'new' socket, leaving me with only one wire to
splice. it was not obvious by testing that this would be the solution.
apparently the polarity reverses when you switch from dims to brights
and it didn't seem to make sense what was going on. but the physical
damage suggested it was the source of the problem and so it was wroth a
try to replace and when replaced it did indeed solve the problem. a
long way to say if you ever used high wattage bulbs then you might want
to closely inspect the wires for signs of melting. if you need a new
socket with leads they are available on ebay.
  #3  
Old April 16th 10, 03:27 PM posted to rec.autos.makers.mazda.miata
Grant Edwards[_3_]
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Posts: 68
Default NB headlight out -- bulb is OK

On 2010-04-16, Christopher Muto > wrote:
> Grant Edwards wrote:
>> The left headlight is out on my NB, but the bulb is OK. Any clues on
>> where else to look? Are the L/R headlights fused separately?

>
> the headlights are not on separate fuses.


I didn't think so, but it would have been an easy fix...

> i had one of mine lamps stop working after running 100w bulbs in
> there a while.


I've never used anything except 55W bulbs, but I guess it's time to
get out the multi-meter and start checking the wiring and connectors.
The connector and wires _look_ fine, but I haven't ohmed anything out
yet.

--
Grant Edwards grant.b.edwards Yow! I have many CHARTS
at and DIAGRAMS..
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  #4  
Old April 16th 10, 06:27 PM posted to rec.autos.makers.mazda.miata
XS11E[_1_]
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Default NB headlight out -- bulb is OK

Grant Edwards > wrote:

> On 2010-04-16, Christopher Muto > wrote:


>>> The left headlight is out on my NB, but the bulb is OK. Any
>>> clues on where else to look?


If you check the wiring diagram you'll eliminate a bunch of stuff, you
need only look from the point where the headlight separates to the bulb
socket.

Wiring diagram, if you don't have one:
http://neomiata.com/garage/index.php...ring+Diagrams/


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  #5  
Old April 16th 10, 08:27 PM posted to rec.autos.makers.mazda.miata
Grant Edwards[_3_]
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Posts: 68
Default NB headlight out -- bulb is OK

On 2010-04-16, XS11E > wrote:
> Grant Edwards > wrote:
>
>> On 2010-04-16, Christopher Muto > wrote:

>
>>>> The left headlight is out on my NB, but the bulb is OK. Any
>>>> clues on where else to look?

>
> If you check the wiring diagram you'll eliminate a bunch of stuff, you
> need only look from the point where the headlight separates to the bulb
> socket.


Thanks

> Wiring diagram, if you don't have one:
> http://neomiata.com/garage/index.php...ring+Diagrams/


Only goes up to 2000, and mines a 2003.

I'll keep searching...

--
Grant Edwards grant.b.edwards Yow! Do I have a lifestyle
at yet?
gmail.com
  #6  
Old April 16th 10, 08:30 PM posted to rec.autos.makers.mazda.miata
Grant Edwards[_3_]
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Posts: 68
Default NB headlight out -- bulb is OK

On 2010-04-16, Grant Edwards > wrote:
> On 2010-04-16, XS11E > wrote:
>> Grant Edwards > wrote:
>>
>>> On 2010-04-16, Christopher Muto > wrote:

>>
>>>>> The left headlight is out on my NB, but the bulb is OK. Any
>>>>> clues on where else to look?

>>
>> If you check the wiring diagram you'll eliminate a bunch of stuff, you
>> need only look from the point where the headlight separates to the bulb
>> socket.

>
> Thanks
>
>> Wiring diagram, if you don't have one:
>> http://neomiata.com/garage/index.php...ring+Diagrams/

>
> Only goes up to 2000, and mines a 2003.
>
> I'll keep searching...


Interestingly, the wiring diagram for the 2000 does show separate
fuzes for L/R headlights...

--
Grant Edwards grant.b.edwards Yow! I'm having a BIG BANG
at THEORY!!
gmail.com
  #7  
Old April 16th 10, 08:48 PM posted to rec.autos.makers.mazda.miata
XS11E[_1_]
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Posts: 738
Default NB headlight out -- bulb is OK

Grant Edwards > wrote:

> Interestingly, the wiring diagram for the 2000 does show separate
> fuses for L/R headlights...


AHA!


--
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The Usenet Improvement Project:
http://twovoyagers.com/improve-usenet.org/
  #8  
Old April 17th 10, 02:21 PM posted to rec.autos.makers.mazda.miata
Chris D'Agnolo[_2_]
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Posts: 587
Default NB headlight out -- bulb is OK


"XS11E" > wrote in message
...
> Grant Edwards > wrote:
>
>> Interestingly, the wiring diagram for the 2000 does show separate
>> fuses for L/R headlights...

>
> AHA!
>
>
> --
> XS11E, Killing all posts from Google Groups
> The Usenet Improvement Project:
> http://twovoyagers.com/improve-usenet.org/


I'd take a look at it assuming it to be the same as the 2000 model, it
probably is. Have you had a chance to verify the 2 fuse deal?

Chris
99BBB

  #9  
Old April 18th 10, 05:28 AM posted to rec.autos.makers.mazda.miata
Grant Edwards[_3_]
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Posts: 68
Default NB headlight out -- bulb is OK

On 2010-04-17, Chris D'Agnolo > wrote:
>
> "XS11E" > wrote in message
> ...
>> Grant Edwards > wrote:
>>
>>> Interestingly, the wiring diagram for the 2000 does show separate
>>> fuses for L/R headlights...

>>
>> AHA!

>
> I'd take a look at it assuming it to be the same as the 2000 model, it
> probably is. Have you had a chance to verify the 2 fuse deal?


Yes, the '03 does have seperate L/R headlight fuzes. The fuze was OK.

It looks like the connector is a bit dodgy. The plastic is melted a
little bit around one of the contacts. After I stuck some chunks of
copper staple into the connector to measure voltages and resistance
(which seemed OK), I plugged the bulb back into it and now it works.

I think one of the contacts got corroded/bent/dirty/something and
increased in resistance -- heating up enough to melt a little bit of
plastic before it went completely open. Messing with it seems to have
"fixed" it, but I'll be shopping for a new connector.

Now if I can just figure out how to get at the back of the fog lights
so I can replace the foglight bulb that's been out for about a year...

--
Grant


 




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