Re: [Chrysler300] Quick-Disconnect Battery Cable

[c300c@xxxxxxx]

Marshall,
 
I am not sure about 1956 300-Bs, but from 1957 forward, Chryslers all use  
negative grounding.
 
300'ly, Gary Hagy
 
 
In a message dated 6/7/2010 2:36:09 P.M. Mountain Daylight Time,  
mgoodknight@xxxxxxxx writes:

I  misstated the reconnect sequence.  I meant to say reconnect the "hot"  
cable first, the reverse sequence of the disconnect.  I say "hot" instead  of 
"pos" or "neg" because our c300s are positive ground systems, making the  
"hot" wires negative polarity.
--------------marshall

----------  Original Message ----------
From: Ray Jones  <hurst300@xxxxxxxxxx>
To: Chrysler 300 Broadcast  <Chrysler300@xxxxxxxxxxxxxxx>
Subject: Re: [Chrysler300]  Quick-Disconnect Battery Cable
Date: Mon, 7 Jun 2010 14:45:31  -0500


Marshall is absolutely right. If the ground is  attached first, it's way 
too easy for the carless wrench tightening the  positive cable to touch ground.

But, the real reason is that a battery  is a storage devise for stored 
energy.
Electricity, the stored energy, is a  strange critter, it always wants to 
work. 
So if you hook up the ground  first, and one or more items in the car are 
on, then there will be a spark as  the connector gets near the + terminal.
The stored energy will "Leap"  across the gap to go to work and supply the 
items that are on, with  power.
If the + terminal is hooked up, and you are attaching the -, ground,  last, 
then the work is done and there will be no or very little  spark.

This really comes in play if you have run down the battery and  there is 
hydrogen gas laying on top of the battery. A product of heavy  discharge.
This is also why you ALWAYS attach the + jumper cable first to  the Battery 
and the - cable to a ground somewhere away from the battery.
i  had a battery blow up in my face and I knew better, but was in a hurry 
and  careless.

The watchband he tells about became the "work" since it  connected the 
power to ground and the watchband, not being real work, created  a short.
A tiny light bulb is work as is a big starter motor, and the  electric 
critter is happy dealing with them. 
Take the work out and just  put the Positive to ground, and they call that 
electric welding. Or in the  case above wrist burning.
Ray

On Jun 7, 2010, at 1:58 PM,  mgoodknight@xxxxxxxx wrote:

The reason you should disconnect the ground  cable first, reconnect the 
"hot" cable last is so that you don't risk shorting  your circuit with your 
wrench as you work with the "hot" cable. 
A short  circuit with good conductors (low resistance) such as a half inch 
box wrench  will get very hot very fast with 200+amps running through 
it-----makes you  want to turn it loose real quick!!!!!!!
Take heed of that hazard and always  disconnect the ground cable when doing 
any kind of work on your car that might  bring you in contact with a "hot" 
terminal, especially if you wear a watch,  ring, necklace, bracelet, metal 
belt buckle, or maybe other hazards. A friend  of mine ignored that rule and 
once got a severe burn on his left wrist from  contacting the power-in lead 
terminal of the distributor with his watchband  while the engine was 
running. HE LEARNED!!!! 
Not a complex scientific  theorem.



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