Simple test fixture for tracking short circuits - JeepForum.com
 
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post #1 of 5 Old 05-18-2020, 11:59 AM Thread Starter
jay-h
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Simple test fixture for tracking short circuits

The problem with identifying shorts in wiring is they seem fine until they blow the fuse, giving you little guidance

Rig up a simple brake/signal bulb in a socket like this, terminate the ends of the leads with trimmed spade terminals. Remove the fuse and put this in its place. The advantage of this is that the bulb works as a current limiter as well as indicator... a dead sort will light the bulb at full normal brightness, but will not allow enough current to fry your wiring. Normal loads will produce reduced brightness.

Put a few feet of wiring on the fixture so that you can place the bulb in a visible location while working on the wiring

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post #2 of 5 Old 05-19-2020, 04:36 PM
mukluk
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Or you can just buy a ready made automotive test light, it's the exact same concept.

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post #3 of 5 Old 05-22-2020, 10:41 AM
gutthans
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Quote:
Originally Posted by mukluk View Post
Or you can just buy a ready made automotive test light, it's the exact same concept.
Yeah, but why spend $8 and up when all of us have junk, like these pieces, laying around?

Last edited by gutthans; 05-22-2020 at 03:48 PM.
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post #4 of 5 Old 05-23-2020, 08:45 AM
V8GCZJ
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Just use a meter and test continuity! Don't have to spend or "rig up" anything. I got plenty of them around.
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post #5 of 5 Old 05-25-2020, 01:41 PM Thread Starter
jay-h
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The reason for using a light like this is that it puts a load on the circuit.

A volt/ohm meter (or for that matter a test light) will not clearly differentiate a legitimate tail light load and a dead short.

By placing a working load on the circuit, it becomes easier to identify when it is shorted yet will not allow overload on the wiring.

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