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RE: Finding open/shorts in car electrical system

To: <shop-talk@autox.team.net>
Subject: RE: Finding open/shorts in car electrical system
From: "Randall" <tr3driver@ca.rr.com>
Date: Tue, 19 Dec 2006 17:53:14 -0800
> Anyway, once you've pulled all the fuses, and found what 
> circuit you have a
> short in
> how do you all find the short in the harness.

Basic idea is to run current through the circuit but limit heat dissipation;
then use something to detect the current.  JZ Witless used to sell a flasher
thing that would replace the fuse, and a moving vane meter that was
sensitive to magnetic fields.  I've done something similar using an old
headlight bulb to limit the current, and a boy scout magnetic compass to
detect the magnetic field.

> Same goes for an open.  You've got something that doesn't 
> work, how do you
> find where
> the break in the wire is?

You can pick up a toner & probe for just about $50 if you shop around ...

Looks like JCW still has the short detector :
http://masl.to/?I2CE1166E
or if that doesn't work, go to 
http://www.jcwhitney.com
and search for "short circuit finder".

Randall


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