On Tue, 12 Jan 2010 20:22:43 -0800, David Nebenzahl
wrote:

On 1/12/2010 5:35 PM mark krawczuk spake thus:

hi, any body got links or schematics for a continuity tester for
automotive use ? preferably simple design with audio and visual
indication , voltage detection would be a bonus !!

How about a 12-volt light and a 12-volt buzzer wired in parallel? Can it
get any simpler than that?

With modern vehicles, you need absolutely minimum current or risk
damaging sensors and other components. A light continuity tester is a
strict no-no...


If you want voltage indication, wire a DMM in parallel with all that.

Just a DMM, with a beeper, will work just fine, their current is very
low and won't damage things.

Just avoid lamps and buzzers that are powered directly through the
test loop.