Hey,

1980 240D 5spd

Assuming I did it correct, here are the results and method:

Car off
One lead from the Multimeter taped down as ground on top of engine, next to oil filler cap
Other lead being put into the holes of the glowplug relay wire connector thing...numbers 1,3,5,2,4,6,7,8 deal, correct?

Multimeter set to 200

Readings (@200ohm setting):

1- .7+/-
2- No reading at all (200-2m ohm settings)
3- .7+/-
6- 1.66 @ 2K ohms
7- .7+/-
8- 7.80 @ 20K ohms

I did it over and over again, sometimes the readings were a little wack, I am guessing do to the pin type leads, but if I pressed down on both leads (pin in the center of the hole) I would usually come up with numbers around the ones posted.

Are these normal readings?
What do the numbers on the wholes represtent/corresponed with?

Thanks,
-Kurt

#2,6, & 8 look very suspect to me I would pull the one, that goes to the gp compare it to a new or normal looking one, then test with 12 volts across the inputs to see if it turns red as was mentioned in the previous threads. The other 2 dont go to the gp's. Your higher ranges on your meter may not have been necessary since normal range was on the lowest scale. As long as your lead connections were good, the test says, look even closer and or replace them. James 80,300D Metallic Blue

Kurt,

I have a 80 240D as well. Here's my spin on the glow plugs. Will probably get the Senior members stirred up on this but here goes:

Autozone has the Bosch glow plugs(80006) for $10 apiece. So that's $40 for the four plugs. Change them all at once. It's not worth the hassle to putz with trying to figure out which one(s) are bad. You'll spend more time on troubleshooting than replacing.

JV

Ktang,

First correlate the socket number in the connector to the GP number by checking the resistance from the sockets to the GP It should read almost a dead short. This way you will know which GP to remove and do the next test to . Note: Only four sockets will be connected to GP.

Any GP that doesn't read about 0.7 ohms is suspect. Do the 12V test (across battery terminals) on any GP that doesn't read 0.7 ohms. Replace any bad GP.

It looks like the GP you listed as 1, 3, 7 are OK. So you probably have only one bad one.

As far is jonvee's advice is concerned, it easier to check the GP with an ohmeter than R&R them and you probably only need to buy and replace one. But I would buy 2 and keep a spare in glove compartment.

P E H