Put the meter on a low resistance (continuity or ohms) scale. If it's an
analog (moving needle) meter, the needle should move all the way to the left
(0 ohms) when you touch the probes together. If it's a digital meter, the
display will read OL with the leads separated and 0 ohms with the leads
touching together. Some digital meters have a continuity function in which
the meter emits a beep when a short circuit is encountered. Kind of handy
in situations where you can't watch the meter and fumble with the probes at
the same time.
The switch on the PDWA has two terminals, but they are connected together,
so if you read between the two terminals, you should get ~0 ohms. Under
normal conditions (no brake failure) you should read infinite resistance
(open circuit) reading from either switch terminal to the body of the PDWA
(ground). If a brake pressure fault is sensed by the PDWA, you will read
continuity, or something close to 0 ohms reading from either terminal to
ground.
I documented my experience with the PDWA on my web page. Good luck!
Mark Anderton
72 TR6
Virginia Beach
http://members.cox.net/andertonm/car_stuff.html
----- Original Message -----
From: "Creamer, Mark" <CreamerM@cintas.com>
To: <6pack@autox.team.net>
Sent: Friday, May 09, 2003 4:07 PM
Subject: Ohm my!
> In Nelson Riedel's topic on rebuilding the PDWA at buckeyetriumphs.org,
> he mentions using an ohm meter to test the functionality of the brake
> light warning switch on the PDWA. But I'm not sure I'm doing it right.
> Can someone help me with what the ohm meter should be set at, and where
> to put the leads? Thanks!!
>
> Mark Creamer
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