DMM

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=57303
Printed Date: May 09, 2025 at 12:23 AM

Topic: DMM

Posted By: trixreppinva
Subject: DMM
Date Posted: June 08, 2005 at 2:45 PM

On a DMM how do you test to see if a fuse is blown?

Replies:

Posted By: vseth
Date Posted: June 08, 2005 at 2:51 PM

Do a continuity test on the two endpoints of the fuse. There is usually a resistance setting with a bell or loudspeaker symbol on the DMM. If there is no continuity, your fuse is blown.

Posted By: thepencil
Date Posted: June 08, 2005 at 2:54 PM

vseth] wrote:

Do a continuity test on the two endpoints of the fuse. There is usually a resistance setting with a bell or loudspeaker symbol on the DMM. If there is no continuity, your fuse is blown.

That's correct. Did you mean an arrow symbol instead?

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Posted By: trixreppinva
Date Posted: June 08, 2005 at 2:58 PM

Also which slots should I have the wires in when Im doing this

Posted By: DYohn
Date Posted: June 08, 2005 at 3:28 PM

Which slots? What do you mean?

Only read continuity through a fuse after it has been pulled from the system. If it's still installed, test it by reading the voltage drop across it. A good fuse will have less than 0.1 volt across it, a bad one will have 12V.

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Posted By: kgerry
Date Posted: June 08, 2005 at 3:40 PM

actually i would just meter voltage on both sides of the fuse in circuit... (this is the same as metering the voltage drop only not as confusing for beginners)....if it's good you'll have 12 v on the fused and the unfused sides, if it's bad you'll only have voltage on the feed side and nothing on the other..... this is way faster than pulling the fuse and metering it for continuity....

BTW, the "arrow" is a diode test setting... use the resistance scale on a x1 setting to meter the fuse for continuity out of circuit....

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Kevin Gerry
Certified Electronics Technician
MECP First Class Installer

Owner/Installer
Classic Car Audio
since 1979

Posted By: Francious70
Date Posted: June 08, 2005 at 4:23 PM

I think he's asking whick holes on the DMM. He dosen't know how to use a DMM.

Put the red wire in the red hole and the black wire in the black hole labeled COMM not 10A

Paul

Posted By: trixreppinva
Date Posted: June 08, 2005 at 4:28 PM

oh i already figured it out but thanks man