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Old 06-30-2005, 04:01 AM   #1
pico
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Default Stupid light bulb......

My battery was drained last week, I took out the battery and let autozone recharge it for me. Then i measured the reisistance between the 2 cables and it show 3.7ohm!!! I checked all the fuse and they're all fine and after 2hrs of peek and poke finally i find out that my trunk light bulb was shorted!! I always thought light bulb will be opened rather than shorted when they goes bad.....
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Old 06-30-2005, 09:04 AM   #2
Mulder
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That is actually a normal resistance reading for a light bulb. The problem isn't the bulb itself, but that it is connected when the trunk is closed. Your problem actually lies with the trunk light switch, rather than the bulb. The switch is either defective or not adjusted properly. You can confirm this by looking through the rear seat pass-through when the trunk is closed, if the light is still on you'll see it. If it is proceed to either adjust or replace the switch.
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Old 06-30-2005, 03:12 PM   #3
pico
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thats true......... but isn't 3.7ohm kinda low??? which means it draws >3 amps when its on..... thats about 40W?!

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Old 06-30-2005, 04:21 PM   #4
Mulder
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The resistance of the filament increases when it heats up. So did you check your switch?
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Old 06-30-2005, 04:34 PM   #5
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The resistance goes up some 10 times, so the power will be in 5W range which is about right.
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Old 06-30-2005, 09:41 PM   #6
pico
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ic, I haven't has time to check it yet. but let say if the switch is bad, which means i has it on for a few days, will it drain my battery out? or do u think i have some other stuff thats drawing power as well??? I guess the light buld is smart and i'm the stupid one...
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Old 06-30-2005, 09:49 PM   #7
Mulder
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Yes a stuck-on trunk light will drain the battery if left alone for a few days. Exactly how long it will take depends on the battery condition and state of charge(may not be too good if it's been discharged already). If you can't get to it right away, just take the bulb out.
Another sign it's been on is if you open the trunk to pull the bulb, and it feels very hot from being on a long time.
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Old 07-01-2005, 04:16 AM   #8
John UK
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It's easy to check if the light is on all the time.
Climb into the trunk and shut the lid.
.
.
.
.
Just make sure a (good) friend is there to let you out again.

John
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Old 07-01-2005, 06:14 AM   #9
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^
Not necessary with the pass-through.
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Old 07-01-2005, 11:10 AM   #10
Rapid_Roo
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Quote:
Originally Posted by Mulder
You can confirm this by looking through the rear seat pass-through when the trunk is closed, if the light is still on you'll see it. If it is proceed to either adjust or replace the switch.
can't hellp but think of the refrigerator.

Quote:
Originally Posted by John UK
It's easy to check if the light is on all the time.
Climb into the trunk and shut the lid. Just make sure a (good) friend is there to let you out again.
John
also there is an emergency trunk release in the trunk. and it glows in the dark.

RR
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Old 07-01-2005, 01:13 PM   #11
ATX25RS
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yep.....scariest thing is when it doesnt work though.....my fat ass cant fit through the pass through
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