Is there a way to test a glass fuse to see if its good, or how to test - Team Camaro Tech
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post #1 of 9 (permalink) Old Oct 18th, 09, 05:20 AM Thread Starter
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Is there a way to test a glass fuse to see if its good, or how to test

Is there a way to test a glass fuse to see if its good, or how to test the terminal in the fuse box for power?
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post #2 of 9 (permalink) Old Oct 18th, 09, 05:26 AM
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Re: Is there a way to test a glass fuse to see if its good, or how to

With it installed it and the fuse box can both be tested for power with a test light or volt meter. One end should have power with the key on, If both ends have power alls good. If no end has power then other wireing issues are present, possibly fuse link. Remember the tail lights have to be on for the inst lamp fuse to have power.

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post #3 of 9 (permalink) Old Oct 18th, 09, 06:32 AM
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Re: Is there a way to test a glass fuse to see if its good, or how to

If it's out of the fuse box, just use a little Ohm meter. Set it for Ohms, touch the two leads together to make sure you get a reading on the meter(continuity). This means the meter is working, good battery inside. Then touch them to the end of the fuse. No continuity means burnt(open) fuse. Also works well with lightbulbs...

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post #4 of 9 (permalink) Old Oct 18th, 09, 06:58 AM Thread Starter
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Re: Is there a way to test a glass fuse to see if its good, or how to

My tail lights are having ground issues, I had to run grounds with aligator clips for now in order to get all those lights working. But the dash lights did work before I took out the SFE 4 fuse , then after I cleaned contacts and replaced with a new fuse dash lights not working.

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post #5 of 9 (permalink) Old Oct 18th, 09, 10:20 AM
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Exclamation Re: Is there a way to test a glass fuse to see if its good, or how to

FYI on using an Ohm meter or DVM:

When set to Ohms to check continuity (IE: a good wire, a good fuse) touch the leads together first as Tom said. The meter (digital readout) should read very close to .2 Ohms. That is a dead short, meaning good continuity with little to no resistance.
The longer a wire or circuit, or if there are connectors or splices in between both ends for instance, there will be more resistance so don't be surprised to see something like 1.0 or 6.2 Ohms. I think spark plug wires are around 8 Ohms.... can't remember. Depends on the wire.
A fuse should read .2 Ohms.
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post #6 of 9 (permalink) Old Oct 18th, 09, 02:42 PM
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Re: Is there a way to test a glass fuse to see if its good, or how to

Quote:
Originally Posted by HwyStarJoe View Post
FYI on using an Ohm meter or DVM:

When set to Ohms to check continuity (IE: a good wire, a good fuse) touch the leads together first as Tom said. The meter (digital readout) should read very close to .2 Ohms. That is a dead short, meaning good continuity with little to no resistance.
The longer a wire or circuit, or if there are connectors or splices in between both ends for instance, there will be more resistance so don't be surprised to see something like 1.0 or 6.2 Ohms. I think spark plug wires are around 8 Ohms.... can't remember. Depends on the wire.
A fuse should read .2 Ohms.
Good addition, Joe. I was thinking about the supercheap analog ones, but digital ones usually have a continuity beep setting, which makes it even easier. Beep = good!

'67 rs - ordered new by my Grandfather
327 L30, K-K, Deluxe int, tach & gauges, 12 bolt posi, 4 speed.

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post #7 of 9 (permalink) Old Oct 19th, 09, 01:24 PM
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Re: Is there a way to test a glass fuse to see if its good, or how to

A decent DVM can be had for as little as $10. Some of the things you give up on the cheepies are 1) accuracy - usually not a big deal 2) auto power off - just remember to turn it off when you're done and 3) good leads - the cheapies tend to tangle, are short and often have probes which bend easily. But when you sum it all up they do the job and won't break the bank.

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post #8 of 9 (permalink) Old Oct 19th, 09, 08:51 PM
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Re: Is there a way to test a glass fuse to see if its good, or how to

Quote:
Originally Posted by HwyStarJoe View Post
FYI on using an Ohm meter or DVM:

When set to Ohms to check continuity (IE: a good wire, a good fuse) touch the leads together first as Tom said. The meter (digital readout) should read very close to .2 Ohms. That is a dead short, meaning good continuity with little to no resistance.
The longer a wire or circuit, or if there are connectors or splices in between both ends for instance, there will be more resistance so don't be surprised to see something like 1.0 or 6.2 Ohms. I think spark plug wires are around 8 Ohms.... can't remember. Depends on the wire.
A fuse should read .2 Ohms.
You should be able to zero out the meter at this point if you are touching the leads together you should have 0 ohms. And as far as your 1.0 to 6.2 ohms most service manuals looks for less than 5 ohms when checking a circuit. And this is kind of a personal habit but if I'm getting more than like 1-1.5 ohms in a circuit i start checking contacts, and what not. Like I said this is just a personal preference but i would ideally like to have only like .2-.7 ohms resistance in a circuit. This of course is going to be totally dependant on the circuit you are actually checking tho.

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post #9 of 9 (permalink) Old Oct 20th, 09, 04:16 AM
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Re: Is there a way to test a glass fuse to see if its good, or how to

True...the test leads usually add .1 or .2 ohms of resistance, especially if you've got extra crap wrapped around them like I do.
In a decent meter you can use the relative (REL) mode to automatically adjust for that.

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