GLOW PLUG TEST

[Large Marge]

I picked up a digital multimeter in the fall and misplaced the instructions, and I need to knw what setting do I set the meter to for testing plugs? Thanks

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[redneckaggie]

ohms, good plug should read about .2 or .4 ohm

 

[finitetime]

has to be a pretty good one to read ohms that small. Got a $60 from Sears and it wasn't good enough. A test light is the easiest way to find them. Don't forget to unplug them before you test them.

 

[79jasper]

has to be a pretty good one to read ohms that small. Got a $60 from Sears and it wasn't good enough. A test light is the easiest way to find them. Don't forget to unplug them before you test them.

Sure you had it set right?
My $25 one from Walmart will.

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[HS108]

Tell 'em Large Marge Sent Ya!!!

Love that movie!!!

 

[finitetime]

Yes it was set right but guy with me did suggest it might be bad leads because I couldn't get it to zero out when i held them together. I might have to check on that. Didn't think about it much at the time but that just isn't right. Just broke out the test light and went with it.

 

[Large Marge]

Thanks everyone! Another dumb ? When ya test using the ohm setting that is testing the continuity right?

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[79jasper]

Different setting.
You're testing the resistance.
But you could probably use that.

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[fordf350man]

continuity will let you know you have a good connection and no breaks in a circuit, you want to use ohms, then you will know for a fact if the glow plug is good or bad

 

[redneckaggie]

any heating element can be tested by continuity, only thing is with a glow plug you may have one that is almost bad and it test good with continuity. when a glow plug goes bad it normally shorts open, so there would be a break in the circuit

 

[fordf350man]

yes, but that is why i said you should check with ohms, then you know if its good or bad and not well it might still be ok

 

[laserjock]

Most heating elements change resistance over time. I have to assume a GP would as well. X2 or 3 or 4 (lost track) on measuring the resistance. It could be way out of spec and still read continuity.

 

[Michael Fowler]

Isn't the better way to test them is to apply 12V from the battery for no more than 4 or 5 seconds to see if the actually glow?

 

[redneckaggie]

I guess you could check them like that to

 

[laserjock]

Pretty hard to do that with them installed. If you had them out I guess that's the sure fire way to be certain.


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