Glow Plugs 1985 300SD - Page 2 - PeachParts Mercedes-Benz Forum

funola · #16 01-04-2014, 10:57 AM

Quote:

Originally Posted by ROLLGUY

I have not experienced that. In fact, the spark is so small that it is barely visible. I am sure it is not enough to damage the terminals in any way.

If you take a closer look with a magnifier, you will see burn marks where the arcs occurred.

ROLLGUY · #17 01-04-2014, 11:33 AM

Quote:

Originally Posted by funola

If you take a closer look with a magnifier, you will see burn marks where the arcs occurred.

Again: "I am sure it is not enough to damage the terminals in any way".

You can look at most anything with a magnifier, and find some kind of degradation. Seeing burn marks with a magnifier does not change or degrade the 99.9999999999 percent of the rest of the contact area of the terminal. I find it strange that you would be concerned about the .0000000001 percent.
The point is that this method for testing glow plugs is the easiest way to get the most accurate results, without any special tools or knowledge. Testing this way has no negative effect whatsoever on the edge of the terminal where the small spark occurs. Testing with a meter is known to NOT be a definitive test.

funola · #18 01-04-2014, 12:16 PM

Quote:

Originally Posted by ROLLGUY

Again: "I am sure it is not enough to damage the terminals in any way".

You can look at most anything with a magnifier, and find some kind of degradation. Seeing burn marks with a magnifier does not change or degrade the 99.9999999999 percent of the rest of the contact area of the terminal. I find it strange that you would be concerned about the .0000000001 percent.
The point is that this method for testing glow plugs is the easiest way to get the most accurate results, without any special tools or knowledge. Testing this way has no negative effect whatsoever on the edge of the terminal where the small spark occurs. Testing with a meter is known to NOT be a definitive test.

10 amp arc is 10 amp arc and it leaves a burn mark period on the contact surface where the arc is. I would never do it that way. I would use a lead with the correct male pin plugged into the harness and make contact and the arc at the battery terminal where it won't hurt anything. Do it your way iif you like.

funola · #19 01-04-2014, 12:44 PM

Quote:

Originally Posted by funola

10 amp arc is 10 amp arc and it leaves a burn mark period on the contact surface where the arc is. I would never do it that way. I would use a lead with the correct male pin plugged into the harness and make contact and the arc at the battery terminal where it won't hurt anything. Do it your way iif you like.

It's actually a 20 amp arc surge on a cold glow plug. 20 amp is a lot of energy concentrated on a small spot.

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