Re: [DML] why denote "negative ground" on stickers

[mike.griese@xxxxxxxxxxxxxxxx]

There were many pre-war US cars that had positive earth, and many
European cars after the war that had positive earth.  It's really just 
an arbitrary designation, as the only difference is which way the electrons
flow.  If you look at the circuit that runs your power windows, it uses
both positive and negative earth to get the motors to turn both directions.
The window switch swaps plus and minus at the motor.  The sticker is
there to remind service people, tow truck operators and anybody else
coming at the car with a set of jumper cables which way to apply them.

--
Mike


-------------- Original message from "daviddlasvegas" <daviddlasvegas@xxxxxxxxx>: -------------- 


> Why do the warning stickers on the car say "this car is negative 
> ground". On a DC electrical system ground has to be negative doesn't 
> it? How could you have a 'positive ground' that doesn't make any sense. 
> 

[Non-text portions of this message have been removed]



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