Re: tom fails basic electricity
On Fri, 03 Jun 2005 01:47:07 GMT, Backyard Mechanic
>Well, almost... not quite.
>This is not 'just' automotives but it aint just basic electricity
>The normal mode of failure in a solid state power switching device is
>short, then open.
>This is because the barrier between the "n" and "p" diode elements has
>been punctured, (for want of a better term, it used to be called "punch-
>through") usually by a voltage difference higher than design specs.. like
>a voltage spike or surge ( can happen if you remove battery cable while
>running. Contamination, either during mfr or by atmospheric incursion
>can also attribute.
>Once it shorts, it overheats then, almost instantly, "burns out" or
>opens. But SOMETIMES there will be a residual path through the device or
>a high resistance short. It wont burn out completely because the current
>is limited by the resistance to the point where the substrate dissipates
>the heat generated.
>What you're looking for is between a .2 and .5 amp draw with key off, is
Close. It can be as high as 3.5 to 4 amps with a "leaky" diode - and
believe me, they do not always fail open. With a diode rated for 120
amps (with a sizeable reserve) and a stator segment drawing even 60,
they can fail shorted and NOT evaporate. I've seen my share in 38
>"tom" <firstname.lastname@example.org> wrote in
>> you see, that is your problem. you do not understand automotive
>> systems. when the diodes in an alternators voltage regulator circuit
>> short out, they act just like a voltage regulator in a 60's car. they
>> will drain the battery. but then since you are a god and know
>> everything and are never wrong, you must be correct and all the
>> alternators that have been changed due to draining the battery were
>> actually just money thrown away, and the problem fixed itself after
>> that money was wasted.
>>> >have your alternator checked. there are diodes in it that if they
>>> >will drain the battery when sitting
>>> >"Turkeybone" <email@example.com> wrote in message
>>> >> I forgot to say that the battery goes dead when the car is off.
>>> tom ya ****ed up again
>>> it wont drain your batteries
>>> the diodes rectify the power off the winding
>>> and they are connected to the winding
>>> YA FOCKTARD
>>> all ciruciuts are OPEN ya tard
>>> its called a SWITCH
>>> as in ya SWITCH it OFF when ya turn the key
>>> the guy has a parasitic drain
>>> please understand the system before ya flap off