Neither.
First note there are no 'positive ground' batteries, only positive ground cars
(e.g. Austin-Healeys). The 'grounding' of the car is determined by which
battery terminal is connected to the chassis (aka 'common').
If the battery is on the bench, charge like you would any battery: positive
(usually red or green) lead from the charger to the positive terminal of the
battery, negative (usually black) terminal to the negative terminal of the
battery. The battery terminals should be marked '+' and '-,' and the positive
terminal is usually larger in diameter than the negative.
If the battery is in the (positive ground) car, connect the negative lead of
the charger to the negative terminal of the battery, and the positive lead of
the charger to (preferably) bare metal on the chassis (make sure the cutoff
switch is on). You can connect the positive lead from the charger to the
positive terminal, but it's generally considered safer to connect to the
chassis (in case there's lingering H2 gas and a spark is created making the
connection--rare, but it happens).
bs
--------------------------------
Bob Spidell - San Jose, CA
----- Original Message -----
From: "Michael Hartfield" <hartfiel@alumni.princeton.edu>
To: "AustinHealey List" <healeys@autox.team.net>
Sent: Thursday, December 9, 2010 11:23:53 AM
Subject: [Healeys] Charging Positive Ground Batteries
When charging positive ground batteries, what is the correct connection, red
to ground, black to positive, or the other way around??
Michael
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