AW: [DML] Re: Automatic

["Elvis Nocita" <elvisnocita@xxxxxx>]

Take a look at the schematic of that "computer" and explain me how
those caps would die of any spikes ? (By the way, those caps are rated
15V, not 35V !)

Even when the battery is "dead" (I mean in case of empty or discharged, NOT
broken) then it still works as an extreme large capacitor and will filter
those spikes.
A malfunctioning or even a good voltage regulator won't do anything to
prevent the car from any electrical spikes.

OK, the possibility to connect the batteries with wrong polaritiy
is always a problem. It's the same problem you have at the gas
station - who prevents you from pouring diesel in the tank ?

Newer cars all can be jump started, that's why they have to qualify
all electronical parts in a car to manage voltages like spikes, bursts,
wrong polarity, load dumps (like disconnecting the battery from the car
while engine is running - as it was suggested 2 weeks ago on this list)
and jump starting with the help of a 24V truck system !

Newer cars must more often be jump started when parked for a few weeks
(like airport) because all the computers in a newer car drain the battery
very fast. That's why they always have a spare battery at those parking
lots.

As long as you stay with 12V there is no problem at all to jump start a car.
Of course the battery still has to be connected !

Elvis & 6548




The current theory is that when you connect another car onto the
electrical circuit of the "dead" car it causes a surge that can spike
the electrical system of the dead car. The capacitors that fail are
only 35 volts so it doesn't take much of a surge to blow them. There
is also the possabilty when jumping of accidently doing it incorrectly
and applying the reverse polarity. On the newest cars they
specifically prohibit jumping the car because of all the computers in
them. You are supposed to remove the battery and recharge it or
replace it with a fully charged battery. In the Delorean I also
believe the other contributing factors include:
Age
A malfunctioning voltage regulator in the alternator
Dirty or loose electrical connections
A bad battery
A very cheaply designed shift computer made with sub-standard parts.
The last factor is probably the single biggest cause. Can you imagine?
the FRENCH making a sub-standard part!!!!!!! It is Renault BTW. As bad
as it is replacing the 2 caps seems to fix most of the shift
computers. That and resoldering all of the cold solder joints.
David Teitelbaum
vin 10757




To address comments privately to the moderating team, please address:
moderators@xxxxxxxxxxx

For more info on the list, tech articles, cars for sale see www.dmcnews.com

To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
     http://groups.yahoo.com/group/dmcnews/

<*> To unsubscribe from this group, send an email to:
     dmcnews-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
     http://docs.yahoo.com/info/terms/