Find a DC short circuit without blowing fuses!
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Find a DC short circuit without blowing fuses!
How to build a 12-Volt Dim-Bulb Tester for troubleshooting shorts in electrical systems.....
Everyone
I learned this trick more than 50 years ago, and it’s a great way to locate an intermittent short circuit in your RV’s 12-volt DC wiring without blowing a bunch of fuses. This 11 minute video shows you how to build and use a Dim Bulb Tester. Please share this with your RVing friends.
You can find this Southwire Clamp Ammeter Model #21050T on Amazon HERE or you can use any clamp ammeter as long as the jaws are rated for AC/DC current.
Lets play safe out there… Mike
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Mark
Very clever Mike. Thanks for sharing! It would be nice to add audio feedback in cases where you can’t see the light bulbs at the ends of the circuit because you are physically separated while wiggling wires in between the fuse and the load. I’ve used an Ohm meter with an audio tone for this purpose but you would normally not use it if the circuit is energized. If there was a voltmeter with an audio tone that changes in proportion to the voltage it was measuring, that would work great! A quick check on Amazon did not turn up anything. Maybe someone out there has heard of one?