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Logic Probe

  • Tutti57
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07 Jun 2019 19:25 #30494 by Tutti57
Logic Probe was created by Tutti57
Does anyone use a logic probe? Is it a test light replacement? What situations would you use it in over a test light?

My Mac dealer screwed up so I got one for free.

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07 Jun 2019 20:27 #30498 by Tyler
Replied by Tyler on topic Logic Probe
The automotive logic probes I've seen connect to both power and ground, and end up working like an LED test light. The only advantage I've seen is not having to switch your polarity.

I haven't seen any value in owning one. But hey, maybe you'll end up loving it! :cheer:
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07 Jun 2019 20:35 #30499 by Tutti57
Replied by Tutti57 on topic Logic Probe
ok, that's what I thought. I was messing around with it a little today and that's basically what I was thinking about it, the polarity thing. Might have to use some long jumpers to reach outside of the engine bay.

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07 Jun 2019 21:29 #30501 by Tutti57
Replied by Tutti57 on topic Logic Probe
I've only have used an incondescent test light. What are the pros and cons of using an led?

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08 Jun 2019 21:05 - 08 Jun 2019 21:30 #30538 by Tyler
Replied by Tyler on topic Logic Probe
Pros, you can't cook anything. :silly: Its current draw is almost non-existent, so you absolutely cannot harm an output.

Cons, it'll lie to you. :angry: The same low current draw can find a ground almost anywhere, which means it can show you screwy readings. Plus, it doesn't load the circuit in question the same way an incandescent bulb will, leaving questions about voltage drop.
Last edit: 08 Jun 2019 21:30 by Tyler.
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10 Jun 2019 07:51 #30568 by Andy.MacFadyen
Replied by Andy.MacFadyen on topic Logic Probe
I have one of those LED test lights that tell you the polarity of what you are probing
I have never found a use for it.
When I want to use an LED test light I use one of those little LED votage probes sold as battery and altrnator testers. It cost about £4 / 5$ from my local Lidl Dicount Store

"There's always a catch ---- Catch OBD2 ."


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