testing glow plugs
I pulled glow plugs on my '94 a few years ago with 300k miles on it (i do not know if they were originals). I did the "test light" test and all eight made the light, light up bright.
I tested each glow plug with a 12 volt jump box and infrared thermometer 4 or 5 would get to about 200* and the others turned pink just at the tip, a new one will turn red for about on inch.
I think the best way to test is to take a 100 amp amp meter and hold it rite on to of the glow plug relay, connecting the relay studs to the studs on the amp meter and then you will see how many amps the glow plus pull. Use the meter on a new glow plug so you know how many amps 1 plug pulls
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