Question about 2000 Mercedes-Benz SL-Class

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Brake Light Fuse & Gas Gauge

When I start my Mercedes sl 500 yr 2000, the gas gauge drops to zero and the brake light fuse blows as soon as I press the brake pedal. I've replaced the fuse and everytime the pedal is pressed the fuse blows out.Can you please help me Thank You.

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Don't forget to check the brake light bulb in the upper stop light in the rear window.

Posted on Oct 31, 2008

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Start by replacing your brake light bulbs. If it still blows the fuse, them your brake pedal switch. If it still happens then you have a shot circuit in your wiring between your fuse panel and your brake lights.

Posted on Jul 10, 2008

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Hi, I have a 2004 Corola and I recently had my flasher fuse replaced 3 times in one day. When I tuen the flasher on it will work fine until I stop and the fuse causes the car to turn off. Do you know


no my answer, dont buy that $500 PCM yet.
the Gauge fuse , see bottom left, above. runs lots of things,
the FSM covers this, fully 100%
it runs the Flasher module, the ECM, the integration module (BCM like) that runs interior lighting and many things off the IM.
if the fuse only blows, while blinking , id inspect all 4 corner lamps
id check the wires there and then replace all 4 lamps. if you
dont know how to bench test a lamp. then just replace them.
Gauge , (funny huh) runs the Alternator, if it shorts, boom the Gauge fuse blows. as you can see finding a short is not easy,
you never said how soon it blows. so,,,,, if quicky, id run it
with no alt connected. rear plug IG Plug pulled. do so for no more
that about 15minutes, the battery will drain fast (no head lights please,or fans for heater, no electrical things on, flashers on for sure.)
see???
there are 30 pages, to see all IG1 power feed wires.
i didnt try to find them all.
but that is my point, if you dont have the book or alldata.com login
then all this is pure wild speculation and guessing.
I did this for a living, so ,know the ropes.
once I have this information, i then use my ammeter to find it.
see a area MASTER here, do that.
Duane
https://www.youtube.com/watch?v=TZrCrBx4uFY

and chris.
https://www.youtube.com/watch?v=n5FJDgcdii8

in your case you know what fuse blows. (stated wrong)
and with that , fact i can attach my ammeter, and the pull
modules to find which one has the active short.
in the case if the blinker module is passing excessive current
I then drop off the lamps loads from the flasher module
if that shows that my short is gone then the lamps are shorted.
i can even measure all 4 lamp wire feed to read this short with my ammeter and my CB.
using this.
http://www.fixkick.com/tools/25100B.jpg

http://www.fixkick.com/tools/25100.jpg
below.
this the red fuse below is GAUGE. the module on the right is the Flasher module.
25319711-3kq0vkr3b25vysxdhfxwpufz-4-0.jpg

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2 Answers

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