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Old 05-16-2016, 03:40 PM   #1
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how to find a short

I pulled three marker lights to replace them with Led's.
I installed 1 LED assuming the wire I tested for zero OHM was the ground.
When I put a spade fuse in the plug it blew. I tested the marker light terminal on the plug and it is grounded somewhere (not inside the plug , I checked).
Can a more precise OHM reading tell me which of the marker light wires is the culprit. (since I have to assume upon removing one of the three lights, I must have pulled on the positive wire and grounded it)
I already tried to push the wires back in as far as I could to see if that might remedy the problem. And the lights worked just fine before I pulled the three marker lights.
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Old 05-16-2016, 03:57 PM   #2
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With power completely off the circuit, measure ohms between each positive light wire and ground (the shell should do for a ground). The one that doesn't read infinity is the culprit. You can stick a sewing pin through the wire if you need a place to connect the ohm meter and don't want to strip insulation.

Good luck.

Enjoyed meeting you at the Johnson City rally.
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Old 05-16-2016, 06:30 PM   #3
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Quote:
Originally Posted by mimiandrews View Post
With power completely off the circuit, measure ohms between each positive light wire and ground (the shell should do for a ground). The one that doesn't read infinity is the culprit. You can stick a sewing pin through the wire if you need a place to connect the ohm meter and don't want to strip insulation.

Good luck.

Enjoyed meeting you at the Johnson City rally.
Thanks for the input. They all read infinite with all the power off.
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Old 05-18-2016, 06:09 AM   #4
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Rivet solved

I failed to remember that the tail lights were in that circuit as well.
Even after removing all the marker lights, I still had zero resistance on all the marker light wires due to the incandescent bulbs in the tail lights..
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Old 05-18-2016, 06:23 AM   #5
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Did you find the short?
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Old 05-18-2016, 06:33 AM   #6
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Did you find the short?
I wrongly assumed there was a short due to the incandescent bulbs in the circuit. The initial fuse blowing was caused by me reversing the wiring of the first LED, I installed.
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Old 05-18-2016, 06:34 AM   #7
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That'll do it. Glad you found the problem.
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