ok,guys...thanks for the replies....i just got back from work and tried to check it out with the remaining ten minutes of daylight i had...now i dont know if im checking them right or even if im checking the right thing....i pulled the cover off of the black box located on the fender right behind the left headlight...inside, theres a harness with 5 pins, a smaller harness with 4 smaller pins, and what looks to be a bar fuse....im assuming thats what i needed to check, the harness with 5 pins....went yesterday and bought a digital multimeter, and have no clue if im checking these glow plugs right...i dont know if im supposed to ground the black lead somehow, or if you just put both leads into the plug you want to test....i tried both ways, and got a reading by inserting both leads into each pin socket on the harness....i got a 0.3 ohm reading on every one of the plugs...with the key on and with it off....something tells me im doing this wrong, i thought the readings would vary from plug to plug....i think i need someone to explain to me, in elementary detail, what i need to do....if the black lead needs to be grounded, where can i ground it at?

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1985 300SD 192,000miles...Astral silver/ Grey MbTex

1983 300D 194,000miles...White/Tan MbTex...my newest addiction