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Car Forum / Driving, Maintenance, Tuning / Car Audio / September 2004

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Scott - 21 Sep 2004 03:15 GMT
I posted this on another NG as an OT post because I knew there were some
guys there who were EE's.

Check out my question and then the response... is this guy's advice true?

I have a 15A fuse blowing everytime I rotate the dashboard dimmer switch to
full on.  If I keep the dash lights off the fuse doesn't blow (even a 10A).
I just installed a new stereo (problem started to happen only after this
change) so I put the old stereo back in but this problem still happens.

Any recommendations?
Should I replace the dimmer switch?
Should I bypass the switch (isn't really useful anyway) and just have them
wired to on?

> Actually all I needed to do was not cross the polarity of the dimmer
> lead. Duh what an idiot I am.  Works great now.

The problem with crossing polarity of dimmer leads is it creates inductive
reactance on the powertrain control module bus producing large voltage
swings which often deteriorates the hFE of the output drivers.  Things may
seem fine now but problems will eventually occur.   Unfortunately the system
component most often affected is the ABS module; your brakes could lock up
or stop working entirely for no apparent reason!  You will need to replace
the driver SMD ICs in the PCM.  http://www.chipquick.com/ is a helpful tool
if you aren't setup to do this on a regular basis.

I highly recommend using that car only on side roads below 15 mph until you
fix this - good luck!
mayhemkrew - 21 Sep 2004 04:52 GMT
don't worry about what this guy says...if the fuse was blowing, your car is
protected.  That's what fuses are used for, to protect something.  I have
seen people use parking light wires as sources of power and grounds and have
me fix their problems and nothing serious has happened because of it.  So I
would not worry at all.

>I posted this on another NG as an OT post because I knew there were some
>guys there who were EE's.
[quoted text clipped - 30 lines]
> you
> fix this - good luck!
MZ - 21 Sep 2004 13:25 GMT
The guy was talking about transient overvoltage conditions harming sensitive
electronics.  A fuse won't protect against this.  Fuses protect against
sustained excess current.

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> don't worry about what this guy says...if the fuse was blowing, your car is
> protected.  That's what fuses are used for, to protect something.  I have
[quoted text clipped - 36 lines]
> > you
> > fix this - good luck!
Scott - 22 Sep 2004 01:09 GMT
"mayhemkrew" <mayhem@*NOSPAM*mayhemkrew.com> wrote in message
> don't worry about what this guy says...if the fuse was blowing, your car
> is protected.  That's what fuses are used for, to protect something.  I
> have seen people use parking light wires as sources of power and grounds
> and have me fix their problems and nothing serious has happened because of
> it.  So I would not worry at all.

Thanks!
 
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