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Fused Automotive alternators was Re: You think alternators

 
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chaztuna(at)adelphia.net
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PostPosted: Sat Feb 18, 2006 5:34 am    Post subject: Fused Automotive alternators was Re: You think alternators Reply with quote

At 07:49 PM 2/17/2006, you wrote:
Quote:

<capsteve(at)adelphia.net>

Let it be known that it's not standard practice for any automotive
manufacturer to protect the alt charging lead or the starter supply wire.
Well, I'm sure there are a "few" exceptions, but I've been contracted to
restore more than a few electrical fireballs. Most recently a 2002 Lexus
gs430 almost met its end when the 4ga starter supply wire met the exhaust
manifold and began to discharge the battery at an accelerated pace. The
braided ground to the engine failed, then the alternate ground paths had to
carry the heavy load. Primarily sensor grounds to the ecm, which then begin
to overheat within the larger harnesses and begin to fuse to other
wires/circuits which propagate the process until either the battery melts
internally and goes critical or discharges.
I've measured inrush currents to some gm starters at over 230 amp which
would make fusing difficult, perhaps they figure why bother??
Alternators typically rated at 100 or 120 amp would be relatively easy to
fuse, but I don't know why they aren't. perhaps the risks that the
alternator melts down internally or the 8ga feed to the batt becomes
compromised is less than the risk that the fuse inline may false and require
a service dept visit.

Just .02

Steven dinieri
Rv221rv

Steve,
I've noted that Ford Expeditions come with a Littelfuse Maxifuse in
the alternator output circuit. It's behind a plastic cover on the
passenger's side of the firewall.
Charlie Kuss
PS Another Ford "fire starter" was their brake fluid pressure sensor
(on the master cylinder) for 1984 to 2000 vehicles. This sensor was
wired battery direct, instead of ignition hot. They can fail at any
time and there have been dozens of auto (and even garage) fires
caused by this. I had one fail will I was working on an Expedition.
It burned the feed wire and scared the hell out me!


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lhelming(at)sigecom.net
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PostPosted: Sat Feb 18, 2006 7:04 am    Post subject: Fused Automotive alternators was Re: You think alternators Reply with quote

Maybe the warnings about always disconnecting the negative battery lead is a
good one. The bad thing about it is on some vehicles you can lose memory on
some devices. My Boxster for example loses the radio security code and
makes the radio silent. Only way to fix it is to input the radio code,
which in my case meant a visit to the local Porsche dealer.

Indiana Larry
Quote:

<chaztuna(at)adelphia.net> You think alternators are safe?

At 07:49 PM 2/17/2006, you wrote:
>
><capsteve(at)adelphia.net>
>

Charlie Kuss
PS Another Ford "fire starter" was their brake fluid pressure sensor
(on the master cylinder) for 1984 to 2000 vehicles. This sensor was
wired battery direct, instead of ignition hot. They can fail at any
time and there have been dozens of auto (and even garage) fires
caused by this. I had one fail will I was working on an Expedition.
It burned the feed wire and scared the hell out me!


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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
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