I had a couple of glow plugs die on me. I replaced the plugs and car starts great. My problem is now the light does not work. All the glow plugs are working and have voltage. Can some one tell me how to verify if it is the light or what? #1 and #2 glow plugs went out and the light will not work. Help please. Thanks

Jack

You arrived at that conclusion on what basis?

Did they give you any warning?

If not, then you should state..........."I had a couple of glow plugs die on me with no warning.

That makes it personal between you and the glow plugs............as though they had a soul and a plan.

I first unplug the glow plug harness and I have a wire made up to plug each of the female 1 through 5. I touch the end of the wire to a 12 volt source and see if I get a spark. I then run the wire through an amp meter and compare the amps. My amp meter reads 2.5 to 3 amps. If the amps match up which they do I know the glow plug is good. Note I did this per instructions from a local MB mechanic.

Jack

No warning at all. Just died.

Jack

Trusting a "local MB mechanic" is your first mistake.

Your test tells nothing. You have a small current draw to the plugs.........that's it.

The first test is to check the resistance of each plug by measuring it at each of the sockets in the harness. If the resistance is less than 1.3 ohms, you have a decent argument that the plugs are good. However, even this test is not a certainty. Others will argue that you need to pull the plugs and glow them with the battery to verify that the tip is heating properly. If the light fails to function and the resistance shows OK, this is your only option.

3 amps is not sufficient amps for the standard glow plug...

your test in not good enough to verify glow. 10 amps would be better, 20 is possible... on cold plugs.

I like to limit the ohms test to 1 ohm... I like to see .6 to .8 but still the light being out, points to more plugs being bad...

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Thanks for the input. I will do some testing tomorrow and report back. Remember I am from South Carolina.

Jack

I am sure that being from South Carolina is no stumbling block to fixing this problem.

__________________
1977 300D Lost coolant while someone else was driving
1983 300D Can't run without oil
1985 300SD (gone but not forgotten)
1990 300TE 4matic Sold
1991 Yamaha Venture
1975 Kawsaki 250 triple
1974 Honda 200CL
1951 8N Ford
2008 Wildfire 650C